Chapter III: Part 3

Fig. 13. represents a rocket compleat without its stick, whose length from the neck is five diameters one sixth; the cases should always be cut to this length, after they are filled: M the head, which is two diameters high, and one diameter one sixth and a half in breadth; N the cone or cap, whose perpendicular height must be one diameter one third. Fig. 14. is the collar to which the head is fixed; this is turned out of deal or any light wood, and its exterior diameter must be equal to the interior diameter of the head; one sixth will be sufficient for its thickness, and round the outside edge must be a groove; the interior diameter of the collar must not be quite so wide as the exterior diameter of the rocket; when this is to be glued on the rocket, you must cut two or three rounds of paper off the case, which will make a shoulder for it to rest upon. Fig. 15, a former for the head; two or three rounds of paper well pasted will be enough for the head, which, when rolled, put the collar on that part of the former marked O, which must fit the inside of it; then with the pinching cord, pinch the bottom of the head into the groove, and tie it with small twine. Fig. 16, represents a former for the cone. To make the caps, cut your paper in round pieces, equal in diameter to twice the length of the cone you intend to make; which pieces being cut into halves, will make two caps each, without wasting any paper; having formed the caps, paste over each of them a thin white paper, which must be a little longer than the cone, so as to project about half an inch below the bottom; this projection of paper, being notch’d and pasted, serves to fasten the cap to the head.

When you load the heads of your rockets with stars, rains, serpents, crackers, scroles, or any thing else, according to your fancy; remember always to put one ladle-ful of meal powder, into each head, which will be enough to burst the head, and disperse the stars or whatever is contained therein: when the heads are loaded with any sort of cases, let their mouths be placed downwards; and after the heads are filled, paste on the top of them a piece of paper, before you put on the caps. As the size of stars often differ, it would be needless to give an exact number for each rocket, but this rule may be observed, that the heads may be nearly filled with whatever they are loaded.

Of the Decorations for Sky Rockets.

Sky rockets bearing the pre-eminence of all fireworks, it will not be improper to treat of their various kinds of decorations which are directed according to fancy; some are headed with stars of different sorts, such as tailed stars, brilliant stars, white stars, blue and yellow stars, &c. some with gold and silver rain; others with serpents, crackers, fire-scroles, marrons; and some with small rockets, and many other devices, as the maker pleases.

Dimensions and Poise of Rocket Sticks.

Weight | Length of |Thickness|Breadth |Square at| Poize from
of the |the stick. | at top. | at top.| bottom. |the point of
rocket.| | | | | the cone.
-------+-----------+---------+--------+---------+-------------
lb. oz.| ft. in. | Inches. | Inches.| Inch. | ft. in.
-------+-----------+---------+--------+---------+-------------
6 0 | 14 0 | 1·5 | 1·85 | 0·75 | 4 1·5
4 0 | 12 10 | 1·25 | 1·40 | 0·625 | 3 9·
2 0 | 9 4 | 1·125 | 1· | 0·525 | 2 9·
1 0 | 8 2 | 0·725 | 0·80 | 0·375 | 2 1·
8 | 6 6 | 0·5 | 0·70 | 0·25 | 1 10·5
4 | 5 3 | 0·3750 | 0·55 | 0·35 | 1 8·5
2 | 4 1 | 0·3 | 0·45 | 0·15 | 1 3·
1 | 3 6 | 0·25 | 0·35 | 0·10 | 11 0·
½ | 2 4 | 0·125 | 0·20 | 0·16 | 8 0·
¼ | 1 10½ | 0·1 | 0·15 | 0·5 | 5 0·5

The last column on the right in the above table, expresses the distance from the top of the cone, where the stick, when tied on, should ballance the rocket, so as to stand in an equilibrium on one’s finger or the edge of a knife. The best wood for the sticks is dry deal, made after the following manner; when you have cut and planed the sticks according to the dimensions given in the table, cut on one of the flat sides at top, a groove the length of the rocket, and as broad as the stick will allow; then on the opposite flat side, cut two notches for the cord, which ties on the rocket, to lay in; one of these notches must be near the top of the stick, and the other facing the neck of the rockets; the distance between these notches may easily be known, for the top of the stick should always touch the head of the rocket. When your rockets and sticks are ready, lay the rockets in the grooves in the sticks and tie them on. Those who, merely for curiosity, may chose to make rockets of different sizes, to what I have expressed in the table of dimensions, may find the length of their sticks, by making them for rockets, from half an ounce to one pounds sixty diameters of the rocket long; and for rockets above one pound, fifty or fifty-two diameters will be a good length; their thickness at top may be about half a diameter, and their breadth a very little more; their square at bottom is generally equal to half the thickness at top. But, although the dimensions of the sticks be very nicely observed, you must depend only on their ballance: for, without a proper counterpoise, your rockets, instead of mounting perpendicularly, will take an oblique direction, and fall to the ground before they are burnt out.

The Method of Boring Rockets which have been drove solid.

Plate 2, Fig. 18, represents the plan of an apparatus, or lath, for boring of rockets; A the large wheel which turns the small one B, that works the reammer C: these reammers are of different sizes according to the rockets; they must be of the same diameter as the top of the bore intended, and continue that thickness a little longer than the depth of the bore required, and their points must be like that of an auger; the thick end of each reammer must be made square and all of the same size, so as to fit into one socket, wherein they are fastened by a screw D: E the guide for the reammer, which is made to move backwards and forwards; so that after you have marked the reammer three diameters and a half of the rocket from the point, set the guide, allowing for the thickness of the fronts of the rocket boxes, and the neck and mouth of the rocket, so that when the front of the large box is close to the guide, the reammer may not go too far up the charge; F, boxes for holding the rockets, which are made so as to fit one in another; their sides must be equal in thickness to the difference of the diameters of the rockets, and their interior diameters equal to the exterior diameters of the rockets. To prevent the rockets turning round while boring, a piece of wood must be placed against the end of the box in the inside, and pressed against the tail of the rocket; this will also hinder the reammer from forcing the rocket backwards. G, a rocket in the box. H, a box that hides under the rocket boxes to receive the borings from the rockets, which falls through holes made on purpose in the boxes; these holes must be just under the mouth of the rocket, one in each box, and all to correspond with each other.

Fig. 19, is a front view of the large rocket box. I, an iron plate, in which are holes of different sizes, through which the reammer passes; this plate is fastened with a screw in the center, so that when you change the reammer, you turn the plate round, but always let the hole you are going to use be at the bottom; the fronts of the other boxes must have holes in them to correspond with them in the plate. K, the lower part of the large box, which is made to fit the inside of the lathe, in order that all the boxes may move quite steady.

Fig. 20, is a perspective view of the lathe. L, the guide for the reammer, which is set by the screw at bottom.

Fig. 21, a view of the front of the guide facing the reammer. M, an iron plate, of the same dimensions as that on the front of the box, and placed in the same direction, and also to turn on a screw in the center. N, the rocket box, which slides backwards and forwards: when you have fixed a rocket in the box, push it forwards against the reammer; and when you think the scoop of the reammer is full, draw the box back, and knock out the composition; this you must do till the rocket is bored, or it will be in danger of taking fire; and if you bore in a hurry, wet the end of the reammer now and then with oil to keep it cool.

Having bored a number of rockets, you must have taps of different sorts according to the rockets. These taps are a little longer than the bore, but when you use them, mark them three diameters and a half from the point, allowing for the thickness of the rocket’s neck; then, holding the rocket in one hand, you tap it with the other. In order to explain these taps, I have represented one by Fig. 22. They are made in the same proportion as the fixed piercers, and are hollowed their whole length.

Of a Hand Machine used for boring of Rockets instead of a Lathe.

Those sort of machines answer very well, but not so expeditious as the lathe, nor are they so expensive to make; they may be worked by one man; but the lathe will require three. Fig. 23, represents the machine. O, the rocket boxes, which are to be fixed and not to slide as those in the lathe. P Q, are guides for the reammers, that are made to slide together, as the reammer moves forward: the reammers for these sort of machines must be made of a proper length, allowing for the thickness of the front of the boxes, and the length of the mouth and neck of the case: on the square end of these reammers, must be a round shoulder of iron, to turn against the outside of the guide Q, by which means the guides are forced forwards. R, the stock which turns the reammer, and while turning must be pressed towards the rocket, by the body of the man who works it; all the reammers are to be made to fit one stock. This machine as well as the lathe is made by the scale in the same plate.

The Manner of making large Gerbes.

Fig. 24, represents a wooden former; 25, a gerbe compleat, with its foot or stand. The cases for gerbes are made very strong, on account of the strength of the composition; which, when fired, comes out with great velocity; therefore, to prevent their bursting, the paper should be pasted, and the cases made as thick at the top as at the bottom; they ought also to have very long necks, for this reason; first, that the particles of iron will have more time to be heated, by meeting with greater resistance in getting out, than with a short neck, which would be burnt too wide before the charge be consumed, and spoil the effect: Secondly, that with long necks the stars will be thrown to a great height, and will not fall before they are spent, or spread too much; but, when made to perfection, will rise and spread in such a manner as to form exactly a wheat-sheaf.

In the ramming of gerbes, there will be no need of a mould, the cases being sufficiently strong to support themselves; but you are to be careful, before you begin to ram, to have a piece of wood made to fit in the neck; for if this be not done, the composition will fall into the neck, and leave a vacancy in the case, which, as I said before, will cause the case to burst as soon as the fire arrives at the vacancy: you must likewise observe, that the first ladle of charge, or two, if you think proper, be of some weak composition. When the case is filled, take out the piece of wood, and fill the neck with some slow charge. Gerbes are generally made about six diameters long, from the bottom to the top of the neck; their bore must be one fifth narrower at top than at bottom. The neck S is one sixth diameter and three fourths long. T, a wooden foot or stand, on which the gerbe is fixed. This may be made with a choak or cylinder, four or five inches long, to fit the inside of the case, or with a hole in it to put in the gerbe; both these methods will answer the same. Gerbes produce a most brilliant fire, and are very when a number of them are fixed in the front of a building, or a collection of fireworks.

N. B. Gerbes are made by their diameters, and their cases at bottom one fourth thick. The method of finding the interior diameter of a gerbe is thus: Supposing you would have the exterior diameter of the case, when made, to be five inches, then, by taking two fourths for the sides of the case, there will remain two inches and a half for the bore, which will be a very good size. These sort of gerbes ought to be rammed very hard.

Of small Gerbes or White Fountains.

Small gerbes may be made of four, eight ounces, or one pound cases, pasted and made very strong, of what length you please; but, before you fill them, drive in dry clay one diameter of their orifice high, and when you have filled a case, bore a vent through the center of the clay to the composition; the common proportion will do for the vent, which must be primed with a slow charge. These sort of cases without the clay, may be filled with Chinese fire.

To make Paste-board and Paper Mortars.

Fig. 26, a former, and 27, an elm foot for the mortar; 28, a mortar compleat; these mortars are best when made with paste-board; your paste-board must be well pasted before you begin; or, instead of paste, you may use glue. For a coehorn mortar, which is four inches two fifths diameter, roll the paste-board on the former one sixth of its diameter thick; and, when dry, cut one end smooth and even, then nail and glue it on the upper part of the foot; when done, cut off the paste-board at top, allowing for the length of the mortar two diameters and a half from the mouth of the powder chamber; then bind the mortar round with a strong cord wetted with glue. U, the bottom part of the foot, is one diameter two thirds broad, and one diameter high; and that part which goes into the mortar is two thirds of it’s diameter high. W, is a copper chamber for powder, made in a conical form, and is one third of the diameter wide, and one and a half of its own diameter long; in the center of the bottom of this chamber, make a small hole a little way down the foot; this hole must be met by another of the same size made in the side of the foot, as is shewn in Fig. 28. If these holes are made true, and a copper pipe fitted into both, the mortar when loaded will prime itself, for the powder will naturally fall to the bottom of the first hole; then, by putting a bit of quick-match in the side hole, your mortar will be ready to be fired.

Mortars of five and a half, eight, and ten inches diameter, may be made of paper, or paste-board, by the above method, and in the same proportion; but if larger, it will be best to have them made of brass. N. B. The copper chamber, must have a small rim round its edge with holes in it, for screws to make it fast in the foot.

SECT. IV.

The Manner of loading Air Ballóóns, with the Number of Stars,
Serpents, Snakes, Rain-falls, &c. contained in Shells of each
Nature.

As ballóóns are held in great esteem, by most admirers of fire works, I shall here give a full description of them in every particular, in so clear a manner, that a young practitioner may, by taking a little pains, be pretty certain of succeeding the first trial.

When you fill your shells, you must first put in the serpents, rains, stars, &c. or whatever they are composed of; then the blowing powder; but the shells must not be quite filled; all those things must be put in at the fuze hole; but marrons, being too large to go in at the fuze hole, must be put in before the inside shell be joined. When the shells are loaded, glue and drive in the fuzes very tight. Of these fuzes we shall say more hereafter; but shall here give the diameter of the fuze hole in ballóóns of each nature, which are as follows. For a coehorn ballóón, let the diameter of the fuze hole be seven eighths of an inch. For a royal ballóón, which is near five inches and a half diameter, make the fuze hole one inch one eighth diameter. For an eight inch ballóón, one inch three eighths: and for a ten inch ballóón, one inch five eighths.

Having proceeded thus far with the directions of loading ballóóns, I shall in the second place give an account of the quantities and number of each article, proper for shells of each nature; but it is to be observed, that air-ballóóns are divided into four sorts, viz. first, illuminated ballóóns; second, ballóóns of serpents; third, ballóóns of reports, marrons, and crackers; and fourth, compound ballóóns.

For a Coehorn Ballóón illuminated.

oz.
Meal powder 1½
Corn powder 0½
Powder for the mortar 2

Length of the fuze composition three quarters of an inch; one ounce drove or rolled stars, as many as will nearly fill the shell.

For a Coehorn Ballóón of Serpents.

oz.
Meal powder 1¼
Corn powder 1
Powder for the mortar 2¼

Length of the fuze composition thirteen sixteenths of an inch; half ounce cases drove three diameters and bounced three diameters; and half ounce cases drove two diameters and bounced four; of each an equal quantity, and as many of them as will fit in easily, placed head to tail.

For a Coehorn Ballóón of Crackers and Reports.

oz.
Meal powder 1¼
Corn powder 0¾
Powder for the mortar 2

Length of the fuze composition three quarters of an inch; reports four, and crackers of six bounces, as many as will fill the shell.

For Compound Coehorn Ballóóns.

oz. dr.
Meal powder 1 4
Corn powder 0 12
Powder for the mortar 2 4

Length of the fuze composition thirteen sixteenths of an inch; half ounce cases drove three diameters and a half and bounced two, sixteen. Half ounce cases drove four diameters and not bounced, ten. Blue strung stars, ten. Rolled stars as many as will compleat the ballóón.

For Royal Ballóóns illuminated.

oz. dr.
Meal powder 1 8
Corn powder 0 12
Powder for the mortar 3 0

Length of the fuze composition fifteen sixteenths of an inch; two ounce strung stars, thirty-four: Rolled stars as many as the shell will contain, allowing room for the fuze.

For Royal Ballóóns of Serpents.

oz. dr.
Meal powder 1 0
Corn powder 1 8
Powder for the mortar 3 8

Length of the fuze composition one inch; one ounce cases drove three and a half and four diameters, and bounced two, of each an equal quantity, sufficient to load the shell.

Royal Ballóóns of Crackers and Marrons.

oz. dr.
Meal powder 1 8
Corn powder 1 4
Powder for firing the mortar 3 0

Length of the fuze composition fourteen sixteenths of an inch; reports twelve, and compleated with crackers of eight bounces.

For Compound Royal Ballóóns.

oz. dr.
Meal powder 1 5
Corn powder 1 6
Powder for the mortar 3 12

Length of the fuze composition one inch; half ounce cases drove and bounced two diameters, eight. Two ounce cases filled three eighths of an inch with star composition, and bounced two diameters, eight. Silver rain-falls, ten. Two ounce tailed stars, sixteen. Rolled brilliant stars, thirty. If this should not be sufficient to load the shell, you may compleat it with gold rain falls.

For eight inch Ballóóns illuminated.

oz. dr.
Meal powder 2 8
Corn powder 1 4
Powder for the mortar 9 0

Length of the fuze composition one inch one eighth; two ounce drove stars, forty-eight. Four ounce cases drove with star composition three eighths of an inch and bounced three diameters, twelve; and the ballóón compleated with two ounce drove brilliant stars.

For eight inch Ballóóns of Serpents.

oz. dr.
Meal powder 2 0
Corn powder 2 0
Powder for the mortar 9 8

Length of the fuze composition one inch three sixteenths. Two ounce cases drove one diameter and a half, and bounced two; and one ounce cases drove two diameters, and bounced two and a half; of each an equal quantity sufficient for the shell.

N. B. The star composition which is drove in cases that are bounced, must be managed thus; first the cases must be pinched close at one end, then the corn powder put in for a report, and the case pinched again close to the powder, only leaving a small vent for the star composition, which is drove at top, to communicate to the powder at the bounce end.

REMARKS.

Ballóóns filled with crackers, reports, and marrons, make no great show of themselves, nor are they very pleasing to the eye, for they represent nothing more than a number of pale white flashes, followed by a variety of reports; which altogether make but a very indifferent appearance when fired with illuminated ballóóns, which are so beautiful and brilliant, as to cast forth such lustre that will dazzle the eyes of the spectators for some time; on this consideration, I do not think it worth while loading shells of a large nature, with things that afford so little pleasure: but they have a pretty good effect in royal shells, when thrown among a number of air works, such as pots des brins or flights of rockets, in order to alarm the people with a thundering in the air. For they will not know from whence the reports came, if fired exactly at the same time with the other works, and the fuze made to carry a small fire. But if any one thinks proper to make large ballóóns of this sort, it is only observing a proportion of the blowing and firing powder, and the length of the fuze, for shells of the same dimensions as those you intend to make. These kind of ballóóns are lighter than any other sort, by reason of the crackers being light of themselves, and not lying close in the shells. It must be observed, when you fire light ballóóns, not to put so much powder in the mortar as for heavy ones.

Compound Eight-inch Ballóóns.

oz. dr.
Meal powder 2 8
Corn powder 1 12
Powder for the mortar 9 4

Length of the fuze composition one inch one eighth; four ounce cases drove with star composition three eighths of an inch, and bounced three diameters, sixteen. Two ounce tailed stars, sixteen. Two ounce drove brilliant stars, twelve. Silver rain-falls, twenty. One ounce drove blue stars, twenty: and one ounce cases drove and bounced two diameters, as many as will fill the shell.

Another of Eight-inches.

oz. dr.
Meal powder 2 8
Corn powder 1 12
Powder for the mortar 9 4

Length of the fuze composition one inch one eighth; crackers of six reports, ten. Gold rains, fourteen. Two ounce cases drove with star composition three eighths of an inch, and bounced two diameters, sixteen. Two ounce tailed stars, sixteen. Two ounce drove brilliant stars, twelve. Silver rains, ten: one ounce drove blue stars, twenty: and one ounce cases drove with a brilliant charge two diameters and bounced three, as many as the shell will hold.

Another of Eight-inches.

oz. dr.
Meal powder 2 12
Corn powder 2 0
Powder for the mortar 9 0

Length of the fuze composition one inch one sixteenth; crackers of six reports, ten. Gold rains, twenty. Two ounce cases drove with star composition half an inch, and bounced two diameters sixteen. Two ounce drove brilliant stars, two ounce drove blue stars, two ounce drove coloured stars, two ounce drove tailed stars, large strung stars, and rolled stars, of each an equal quantity, sufficient for the ballóón.

For a compound Ten-inch Ballóón.

oz. dr.
Meal powder 3 4
Corn powder 2 8
Powder for the mortar 12 8

Length of the fuze composition fifteen sixteenths of an inch; one ounce cases drove and bounced three diameters, sixteen. Crackers of eight reports, twelve. Four ounce cases drove half an inch with star composition, and bounced two diameters, fourteen. Two ounce cases drove with brilliant fire one diameter and a quarter, and bounced two diameters, sixteen. Two ounce drove brilliant stars, thirty. Two ounce drove blue stars, thirty. Gold rains, twenty. Silver rains, twenty: after all these are put in, fill the remainder of the case with tailed and rolled stars.

For a Ten-inch Ballóón of three Changes.

oz. dr.
Meal powder 3 0
Corn powder 3 2
Powder for the mortar 13 0

Length of the fuze composition one inch; the shell must be loaded with two ounce cases, drove with star composition a quarter of an inch, and on that one diameter of gold fire, then bounced three diameters; or with two ounce cases first filled one diameter with gold-fire, then a quarter of an inch with star composition, and on that one diameter and a quarter of brilliant fire. These cases must be well secured at top of the charge, lest they should take fire at both ends, but their necks must be larger than the common proportion.

To make Ballóón Fuzes.

Fuzes for air ballóóns are sometimes turned out of dry beech, with a cup at top, to hold the quick-match, as you see in Plate II. Fig. 28, but if made with pasted paper, they will do as well: the diameter of the former for fuzes for coehorn ballóóns, must be half an inch; for a royal fuze, five eighths of an inch; for an eight inch fuze, three quarters of an inch; and for a ten inch fuze, seven eighths of an inch. Having rolled your cases, pinch and tie them almost close at one end; then drive them down, and let them dry; before you begin to fill them, mark, on the out side of the case, the length of charge required, allowing for the thickness of the bottom; and when you have rammed in the composition, take two pieces of quick-match, about six inches long, and lay one end of each on the charge, and then a little meal powder, which ram down hard; the loose ends of the match double up into the top of the fuze, and cover it with a paper cap to keep it dry. When you put the shells in the mortars, uncap the fuzes, and pull out the loose ends of the match, and let them hang on the sides of the ballóóns; the use of the match is, to receive the fire from the powder in the chamber of the mortar, in order to light the fuze: the shell being put in the mortar with the fuze uppermost, and exactly in the center; sprinkle over it a little meal-powder, and it will be ready to be fired. Fuzes made of wood must be longer than those of paper, and not bored quite through, but left solid about half an inch at bottom; and when you use them, saw them off to a proper length, measuring the charge from the cup at top.

Of Tourbillons.

Having filled some cases within about one diameter and a half, drive in a ladle full of clay, then pinch their ends close, and drive them down with a mallet; when done, find the center of gravity of each case, where you nail and tie a stick which should be half an inch broad at the middle, and run a little narrower to the ends these sticks must have their ends turned upwards, so that the cases may turn horizontally on their centers: at the opposite sides of the cases at each end, bore a hole close to the clay with a gimblet, the size of the neck of a common case of the same nature; from these holes draw a line round the case, and at the under part of the case bore a hole, with the same gimblet, within half a diameter of each line towards the center; then from one hole to the other draw a right line. This line divide into three equal parts, and at X and Y, Fig. 29, Plate III. bore a hole, then from these holes to the other two, lead a quick-match, over which paste a thin paper. Fig. 30, represents a tourbillon as it should lay to be fired, with a leader from one side hole A, to the other B. When you fire tourbillons, lay them on a smooth table, with their sticks downwards, and burn the leader thro’ the middle with a port fire. They should spin three or sour seconds on the table before they rise, which is about the time the composition will be burning, from the side holes to those at bottom.

To tourbillons may be fixed reports, in this manner; in the center of the case at top, make a small hole, and in the middle of the report make another; then place them together, and tie on the report, and with a single paper secure it from sire, this being done your tourbillon is compleated. By this method you may fix on tourbillons, small cones of stars, rains, &c. but be careful not to load them too much. One eighth of an inch will be enough for the thickness of the sticks, and their length equal to that of the cases.

The Manner of making Mortars, for throwing Aigrettes and loading and firing the same.

Mortars used for throwing aigrettes are generally made of paste-board, of the same thickness as ballóón mortars, and two diameters and a half long in the inside from the top of the foot; the foot must be made of elm without a chamber, but flat at top, and in the same proportion as those for ballóón mortars; these sort of mortars must also be bound round with cord as before mentioned; sometimes eight or nine of these sort of mortars, of about three or four inches diameter, are bound all together so as to appear but one; but when they are made for this purpose, the bottom of the foot must be of the same diameter as the mortars; and only half a diameter high. Your mortars being bound well together, fix them on a heavy solid block of wood: to load these mortars, first put on the inside bottom of each, a piece of paper, and on it spread one ounce and a half of meal and corn powder mixed; then tie your serpents up in parcels with quick-match, and put them in the mortar with their mouths downwards; but take care that the parcels do not sit too tight in the mortars, and that all the serpents have been well primed with powder, wetted with spirit of wine; on the top of the serpents in each mortar lay some paper or tow; then carry a leader from one mortar to the other all round, and then from all the outside mortars into that in the middle; these leaders must be put between the cases, and the sides of the mortar down to the powder at bottom: in the center of the middle mortar, fix a fire-pump or brilliant fountain, which must be open at bottom, and long enough to project out of the mouth of the mortar; then paste paper on the tops of all the mortars.

Mortars thus prepared are called a nest of serpents, as represented by Fig. 31. When you would fire these mortars, light the fire-pump C, which when consumed will communicate to all the mortars at once, by means of the leaders. For mortars of six, eight, or ten inches diameter, the serpents should be made in one and two ounce cases, six or seven inches long, and fired by a leader, brought out of the mouth of the mortar, and turned down the outside, and the end of it covered with paper, to prevent the sparks of the other works from setting it on fire. For a six inch mortar, let the quantity of powder for firing be two ounces; for an eight inch, two ounces and three quarters; and for a ten inch, three ounces and three quarters; care must be taken in these as well as small mortars, not to put the serpents in too tight, for fear of bursting the mortars. These sort of mortars may be loaded with stars, crackers, &c.

If the mortars, when loaded, are to be sent any distance, or liable to be much moved, the firing powder should be secured from getting amongst the serpents, which would endanger the mortars, as well as hurt their performance; to prevent which, load your mortars after this manner; first put in the firing powder and spread it equally about; then cut a round piece of blue touch-paper, equal to the exterior diameter of the mortar, and draw on it a circle, equal to the interior diameter of the mortar, and notch it all round as far as that circle; then paste that part which is notched, and put it down the mortar close to the powder, and stick the pasted edge to the mortar; this will keep the powder always smooth at bottom, so that it may be moved or carried any where, without receiving any damage. The large single mortars are called pots des aigrettes.

The Manner of making, loading, and firing of Pots des Brins.

These pots are made of paste-board, and must be rolled pretty thick; they are usually made three or four inches diameter, and four diameters long, and pinched with a neck at one end, like common cases; a number of these are placed on a plank in the following manmer: having fixed on a plank, two rows of wooden pegs, cut, in the bottom of the plank, a groove the whole length under each row of pegs; then, through the centre of each peg, bore a hole down to the groove at bottom, and on every peg fix and glue a pot, whose mouth must fit tight on the peg; thro’ all the holes run a quick-match, one end of which must go into the pot, and the other into the groove, which must have a match laid in it from end to end, and covered with paper, so that when lighted at one end, it may discharge the whole almost instantaneously: in all the pots put about one ounce of meal and corn powder; then in some put stars, and others rains, snakes, serpents, crackers, &c. when they are all loaded, paste paper over their mouths. Two or three hundred of these pots being fired together, make a very pretty show, by affording so great a variety of fires. Fig. 32, is a range of pots des brins, with the leader A, by which they are fired.

Of Pots des Saucissons.

Saucissons are generally fired out of large mortars without chambers, the same as those for aigrettes, only somewhat stronger: saucissons are made of one and two ounce cases, five or six inches long, and choaked in the same manner as serpents; half the number which the mortar contains, must be drove one diameter and a half with composition, and the other half two diameters, so that when fired they may give two volleys of reports; but if the mortars be very strong, and will bear a sufficient charge, to throw the saucissons very high, you may make three volleys of reports, by dividing the number of cases into three parts, and making a difference in the height of the charge: after they are filled, pinch and tie them at top of the charge, almost close; only leaving a small vent to communicate the fire to the upper part of the case, which must be filled with corn powder very near the top; then pinch the end quite close, and tie it; after this is done, bind the case very tight with waxed pack-thread, from the choak at top of the composition, to the end of the case; this will make the case very strong in that part, and cause the report to be very loud: saucissons should be rolled a little thicker of paper than the common proportion. When they are to be put in the mortar, they must be primed in their mouths, and fired by a case of brilliant fire, fixed in their center.

The charge for these sort of mortars should be one sixth, or one eighth, more than for pots des aigrettes of the same diameter.

To fix one Rocket on the Top of another.

When sky rockets are thus managed, they are called towering rockets, on account of their mounting so very high. Towering rockets are made after this manner; fix on a pound rocket a head without a collar; then take a four ounce rocket, which may be headed or bounced, and rub the mouth of it with meal powder wetted with spirit of wine, when done put it in the head of the large rocket with its mouth downwards; but before you put it in, stick a bit quick-match in the hole in the clay of the pound rocket, which match should be long enough to go a little way up the bore of the small rocket, in order to fire it, when the large one is burnt out; the four ounce rocket being too small to fill the head of the other, roll round it as much tow as will make it stand upright in the center of the head: the rocket being thus fixed, paste a single paper round the opening of the top of the head of the large rocket. The large rocket must have only half a diameter of charge rammed above the piercer, for if filled to the usual height, it would turn before the small one takes fire, and entirely destroy the intended effect; when one rocket is headed with another, there will be no occasion for any blowing powder; for the force with which it lets off, will be sufficient to disingage it from the head of the first fired rocket. The sticks for these sort of rockets, must be a little longer than for those headed with stars, rains, &c.

Of Caduceus Rockets.

Caduceus rockets in rising form two spiral lines, or double worm, by reason of their being placed obliquely, one opposite the other; and their counterpoise in their center, which causes them to rise in a vertical direction. Rockets for this purpose, must have their ends choaked close, without either head or bounce; for a weight at top, would be a great obstruction to their mounting; though I have known them sometimes to be bounced, but then they did not rise so high as those that were not, nor do any Caduceous rockets ascend so high as single ones; because of their serpentine motion, and likewise the resistance of air, which is much greater than two rockets of the same size would meet with, if fired singly.

By Fig. 33. you see the method of fixing these rockets: the sticks for this purpose, must have all their sides equal, which sides should be equal to the breadth of a stick, proper for a sky rocket of the same weight as those you intend to use, and to taper downwards as usual, long enough to ballance them, one length of a rocket, from the cross stick; which must be placed from the large stick, six diameters of one of the rockets, and its length seven diameters so that each rocket when tied on, may form with the large stick an angle of sixty degrees. In tying on the rockets, place their heads on the opposite sides of the cross stick; and their ends on the opposite sides of the long stick, then carry a leader from the mouth of one, into that of the other. When these rockets are to be fired, suspend them between two hooks or nails, then burn the leader through the middle, and both will take fire at the same time. Rockets of one pound, are a good size, for this use.

Of Honorary Rockets.

Honorary rockets are the same as sky rockets, except that they carry no head nor report, but are closed at top, on which is fixed a cone, then on the case, close to the top of the stick, you tie a two ounce case, about five or six inches long, filled with a strong charge, and pinched close at both ends; then in the reverse sides at each end, bore a hole, in the same manner as in Tourbillons; from each hole, carry a leader, into the top of the rocket. When the rocket is fired, and arrived to its proper height, it will give fire to the case at top, which will cause both rocket and stick, to spin very fast, in their return, and represent a worm of fire, descending to the ground.

There is another method of placing the small case, which is by letting the stick rise a little above the top of the rocket, and tying the case to it, so as to rest on the rocket: these sort of rockets have no cones.

There is also a third method, by which these kind of rockets are managed, which is thus: In the top of the rocket fix a piece of wood, in which drive a small iron spindle, then make a hole in the middle of the small case, through which put the spindle; then fix on the top of it a nut, to keep the case from falling off; when this is done, the case will turn very fast, without the rocket: but this method does not answer so well, as either of the former.

Fsg. 34. is a honorary rocket compleat. The best sized rockets for this purpose are those of one pound.

To divide the Tail of a Sky Rocket, so as to form an Arch when ascending.

Having some rockets made, and headed according to fancy, and tied on their sticks; get some sheet tin, and cut it into round pieces, about three or four inches diameter, then on the stick of each rocket, under the mouth of the case, fix one of these pieces of tin; sixteen inches from the rockets neck, and support it by a wooden bracket, as strong as possible: the use of this, is, that when the rocket is ascending, the fire will play with great force on the tin, which will divide the tail in such a manner, that it will form an arch, as it mounts, (and will have a very good effect if well managed) if there be a short piece of port-fire, of a strong charge, tied to the end of the stick, it will make a great addition; but this must be lighted, before you fire the rocket.

To make several Sky Rockets, rise together, in the same direction, and equally distant from each other.

Take six or any number of sky rockets, of what size you please; then cut some strong pack-thread, into pieces of three or four yards long, and tie each end of these pieces to a rocket in this manner. Having tied one end of your pack-thread, round the body, of one rocket, and the other end to another; take a second piece of pack-thread and make one end of it fast to one of the rockets already tied, and the other end to a third rocket, so that all the rockets except the two outside ones will be fastened to two pieces of pack-thread; the length of thread, from one rocket to the other, may be what the maker pleases; but the rockets must be all of a size, and their heads filled with the same weight of stars, rains, &c.

Having thus done, fix in the mouth of each rocket, a leader of the same length; and, when you are going to fire them, hang them almost close together, then tie the ends of the leaders together, and prime them; this prime being fired, all the rockets will mount at the same time, and divide themselves as far as the firings will allow; which division they will keep, provided they are all rammed alike, and well made. These sort of rockets, are called by some, chained-rockets.

Of Signal Sky Rockets.

Signal-rockets are made of several sorts, according to the different signals intended to be given: but in Artificial Fireworks, two sorts are only made use of, which are one with reports, and the other without any thing, except the charge; but those for the use of the Navy and Army, are headed with stars, serpents, &c.――――Rockets which are to be bounced, must have their cases made one and a half or two diameters longer, than the common proportion, and after they are filled, drive in a double quantity of clay, then bounce and pinch them, after the usual manner, and fix on each a cap.

Signal sky rockets without bounces, are nothing more than common sky rockets, closed and caped: rockets of this sort are very light, therefore do not require such heavy sticks as those with loaded heads, for which reason, you may cut one length of the rocket, off the stick, or else make them thinner.

Signal rockets with reports, are sometimes fired in small flights, and often both these and those without reports, are used, for a signal, to begin firing a collection of works; and occasionally, for many other purposes.

How to fix two or more Sky Rockets on one stick.

Two, three, or six sky rockets, fixed on one stick, and fired together, make a grand and beautiful appearance; for the tails of all will seem but as one of an immense size, and the breaking of so many heads at once, will resemble the bursting of an air ballóón; but the management of this device, requires a skilful hand; therefore for the encouragement of those who are fond of curious performances, I shall give such instructions, that, if well observed, even by those who have not made a great progress in this art, there will be no doubt, of the rockets having the desired effect.

Rockets for this purpose, must be made with the greatest exactness, all rammed by the same hand, in the same mould, and out of the one proportion of composition; and after they are filled and headed, must all be of the same weight; the stick must also be well made, (and proportioned) according to the following directions: first supposing your rockets to be half pounders, whose sticks are six feet six inches long, then if two, three, or six of these are to be fixed on one stick, let the length of it, be nine feet nine inches, then cut the top of it, into as many sides, as there are rockets, and let the length of each side be equal to the length of one of the rockets without its head; and in each side, cut a groove (as usual,) then from the grooves, plane it round, down to the bottom, where its thickness must be equal to half the top of the round part. As the thickness of these sort of sticks, cannot be exactly ascertained, I shall give a rule which generally answers, for any number of rockets above two: the rule is this; that the stick at top, must be thick enough when the grooves are cut, for all the rockets to lay, without pressing each other, though as near together as possible.

When only two rockets, are to be fixed on one stick, let the length of the stick be, according to the last given proportion, but shaped after the common method, and the breadth and thickness, double the dimensions, given in the table page, 94. The point of poise, must be in the usual place, (let the number of rockets be what they will): if sticks made by the above directions, should be too heavy, plane them thinner; and if too light, make them thicker; but always make them of the same length.

When more than two rockets, are tied on one stick, there will be some danger, of their flying up without the stick, unless the following precaution be taken, for cases being placed on all sides, there can be no notches, for the cord which ties on the rockets, to lay in; therefore instead of notches, drive a small nail, in each side of the stick, between the necks of the cases; and let the cord which goes round their necks, be brought close under the nails; by this means, the rockets will be as secure, as when tied on singly. Your rockets being thus fixed, carry a quick-match without a pipe, from the mouth of one rocket to the other; this match being lighted will give fire to all the rockets at once.

Notwithstanding the directions already given, may be sufficient, for the management of those sort of rockets; I shall here add an improvment, of my own, on a very essential part of this device, which is, that of hanging the rockets, to be fired; for before I hit upon the following method, many of my essays, proved unsuccessful; but to prevent such perplexities, instead of the old and common manner of hanging them on nails or hooks, make use of this contrivance, have a ring made of strong iron wire, large enough for the stick to go in, as far as the mouths of the rockets, then let this ring be supported by a small iron, at some distance, from the post or stand, to which it is fixed; then have another ring, fit to receive and guide the small end of the stick; rockets thus suspended will have nothing to obstruct their fire; but when they are hung on nails or hooks, in such a manner, that some of their mouths, are against or upon a rail, there can be no certainty of their rising, in a vertical direction.

Of Sky Rockets without sticks.

To fire rockets without sticks, you must have a stand made in this manner; get a block of wood, one foot diameter or there abouts, and make the bottom of it flat, so that it may stand steady; in the center of the top of this block, draw a circle two inches and a half diameter, and divide the circumference of it into three equal parts; then take three pieces of thick iron wire, each about three feet in length, and drive them into the block, one at each point made on the circle; when these wires, are drove in, deep enough to hold them fast, and upright, so that the distance from one to the other, be the same at top, as at bottom, the stand is compleat.