Chapter XVIII: Section II: , MANUFACTURE OF STEEL: Chap. 14. Cementation

and other Methods--15. Manufacture by Bessemer Process--16.
Siemens-Martin Process--17. Other Methods. Section III., CHEMICAL
AND PHYSICAL PROPERTIES OF STEEL: Chap. 18. Phosphorus in
Steel--19. The Use of Manganese--20. Spiegeleisen--21. Sulphur in
Steel--22. Silicon in Steel--23. Tensile Strength of Steel--24.
Mechanical Tests of Steel--25. Analysis of Steel. Section
IV., USES OF STEEL: Chap. 26. Application of Steel to Railway
Purposes--27. To Shipbuilding--28. To Bridge Building--29. To
General Purposes--30. Guns and Armour Plates--31. Other Purposes.

* * * * *

_Compensations_: a Text-book for Surveyors, in Tabulated Form. By BANISTER FLETCHER. Crown 8vo, cloth, 5_s._

CONTENTS:

The Varieties of Damage for which Claims may arise--Various
Classes of Property--Points to be observed in Surveys--Notices
to Treat--Nature of Damage for which Claims can and cannot be
sustained--What Property can be compulsorily taken--When Entry
on Property can and cannot be compulsorily made--Of Goodwill and
Stock--and of the various Legal Methods of Settlement of Disputed
Claims--together with Full and Explicit Instructions on the
Methods of Valuing and of Making Claims; with Comments on Cases
arising under the Metropolis Local Management and Metropolitan
Buildings Acts; the whole given in a Practical and Comprehensive
Form, supplemented by a copious Appendix, containing many Useful
Forms and Precedents, and also Tables for the Valuation of
Freeholds, Leaseholds, Reversions, and Life-Interests.

* * * * *

_Dilapidations_: a Text-book for Architects and Surveyors, in Tabulated Form. By BANISTER FLETCHER, Fellow Royal Inst. Brit. Arch. (Author of ‘Model Houses’). Showing who are liable for Dilapidations, and the extent of the liability of Lessors, Lessees, Tenants at will, Tenants by elegit, Statute, Merchant, or Staple Tenants in fee simple, Tenants in tail, Tenants for life, Tenants for years without impeachment of Waste, Mortgagor, Mortgagee in possession, Yearly Tenants, Tenants in common, and joint Tenants, Rights of coparceners; also what are dilapidations and waste, and further fully instructs the surveyor how to take and value them, to which is added the duties of surveyors, with a table of legal cases, embracing the most recent, and illustrated throughout by examples drawn from the author’s experience, and latest legal decisions. Crown 8vo, cloth, 5_s._

* * * * *

_Quantity Surveying, for the use of Architects, Builders, and Engineers._ By J. LEANING. _With 42 illustrations._ 375 pages, crown 8vo. cloth, 9_s._

* * * * *

_Spons’ Dictionary of Engineering, Civil, Mechanical, Military, and Naval_; with technical terms in French, German, Italian, and Spanish, 3100 pp., and _nearly 8000 engravings_, in super-royal 8vo, in 8 divisions, 5_l_. 8_s._ Complete in 3 vols., cloth, 5_l._ 5_s._ Bound in a superior manner, half-morocco, top edge gilt, 3 vols., 6_l._ 12_s._

_See page 16._

* * * * *

_A Treatise on the Origin, Progress, Prevention, and Cure of Dry Rot in Timber_; with Remarks on the Means of Preserving Wood from Destruction by Sea-Worms, Beetles, Ants, etc. By _Thomas Allen Britton_, late Surveyor to the Metropolitan Board of Works, etc., etc. _Plates_, crown 8vo, cloth, 7_s._ 6_d._

* * * * *

_Metrical Tables._ By _G. L. Molesworth_, M.I.C.E. 32mo, cloth, 1_s._ 6_d._

CONTENTS.

General--Linear Measures--Square
Measures--Cubic Measures--Measures of
Capacity--Weights--Combinations--Thermometers.

* * * * *

_A Handbook of Electrical Testing._ By H. R. KEMPE, Assoc, of the Society of Telegraph Engineers. _With Illustrations._ Fcap. 8vo, cloth, 5_s._

* * * * *

_Electricity_; its Theory, Sources, and Applications. By JOHN T. SPRAGUE, Member of the Society of Telegraph Engineers. With 91 _woodcuts_ and 30 valuable Tables. Crown 8vo, cloth, 8_s._

* * * * *

_Electro-Telegraphy._ By FREDERICK S. BEECHEY, Telegraph Engineer, a Book for Beginners. Fcap. 8vo, cloth, 1_s._ 6_d._

* * * * *

_Handrailing: by the Square Cut._ By JOHN JONES, Staircase Builder. Fourth edition. _With seven plates._ 8vo, cloth, 3_s._ 6_d._

* * * * *

_Spons’ Engineers’ and Contractors’ Illustrated Book of Prices of Machines, Tools, Ironwork, and Contractors’ Material; and Engineers’ Directory._ Third edition, 4to, cloth, 6_s._

* * * * *

_The Gas Consigners Handy Book._ By WILLIAM RICHARDS, C.E. _Illustrated._ 18mo, sewed, 6_d._

* * * * *

_A Practical Treatise on Natural and Artificial Concrete, its Varieties and Constructive Adaptations._ By HENRY REID, Author of the ‘Science and Art of the Manufacture of Portland Cement.’ _With numerous woodcuts and plates_, 8vo, cloth, 15_s._

* * * * *

_The Gas Analyst’s Manual._ By F. W. HARTLEY, Assoc. Inst. C.E., etc. _With numerous illustrations._ Crown 8vo, cloth, 6_s._

* * * * *

_The French-Polisher’s Manual._ By a French-Polisher; containing Timber Staining, Washing, Matching, Improving, Painting, Imitations, Directions for Staining, Sizing, Embodying, Smoothing, Spirit Varnishing, French-Polishing, Directions for Repolishing. Third edition, royal 32mo, sewed, 6_d._

* * * * *

_A Pocket-Book of Useful Formulæ and Memoranda for Civil and Mechanical Engineers._ By GUILFORD L. MOLESWORTH, Mem. Inst. C. E., Consulting Engineer to the Government of India for State Railways. Twentieth edition, 32mo, roan, 6_s._; or printed on India paper and bound in pocket-book form, in russia or morocco, 7_s._ 6_d._

SYNOPSIS OF CONTENTS:

Surveying, Levelling, etc.--Strength and Weight of
Materials--Earthwork, Brickwork, Masonry, Arches, etc.--Struts,
Columns, Beams, and Trusses--Flooring, Roofing, and Roof
Trusses--Girders, Bridges, etc.--Railways and Roads--Hydraulic
Formulæ--Canals, Sewers, Waterworks, Docks--Irrigation and
Breakwaters--Gas, Ventilation, and Warming--Heat, Light, Colour,
and Sound--Gravity: Centres, Forces, and Powers--Mill-work,
Teeth of Wheels, Shafting, etc.--Workshop Recipes--Sundry
Machinery--Animal Power--Steam and the Steam Engine--Water-power,
Water-wheels, Turbines, etc.--Wind and Windmills--Steam
Navigation, Ship Building, Tonnage, etc.--Gunnery, Projectiles,
etc.--Weights, Measures, and Money--Trigonometry, Conic Sections,
and Curves--Telegraphy--Mensuration--Tables of Areas and
Circumference, and Arcs of Circles--Logarithms, Square and Cube
Roots, Powers--Reciprocals, etc.--Useful Numbers--Differential
and Integral Calculus--Algebraic Signs--Telegraphic Construction
and Formulæ.

“Most of our readers are already acquainted with Molesworth’s
Pocket-book, and not a few, we imagine, are indebted to it for
valuable information, or for refreshers of the memory. The book
has been re-arranged, the supplemental formulæ and tables added
since the first issue having now been incorporated with the
body of the book in their proper positions, the whole making a
handy size for the pocket. Every care has been taken to ensure
correctness, both clerically and typographically, and the book
is an indispensable _vade-mecum_ for the mechanic and the
professional man.”--_English Mechanic._

* * * * *

_Spons’ Tables and Memoranda for Engineers_; selected and arranged by J. T. HURST, C.E., Author of ‘Architectural Surveyors’ Handbook,’ ‘Hurst’s Tredgold’s Carpentry,’ etc. 64mo, roan, gilt edges, third edition, revised and improved, 1_s._ Or in cloth case, 1_s._ 6_d._

This work is printed in a pearl type, and is so small, measuring
only 2½ in. by 1¾ in. by ¼ in. thick, that it may be easily
carried in the waistcoat pocket.

“It is certainly an extremely rare thing for a reviewer to
be called upon to notice a volume measuring but 2½ in. by 1¾
in., yet these dimensions faithfully represent the size of the
handy little book before us. The volume--which contains 118
printed pages, besides a few blank pages for memoranda--is,
in fact, a true pocket-book, adapted for being carried in the
waistcoat pocket, and containing a far greater amount and
variety of information than most people would imagine could
be compressed into so small a space. … The little volume has
been compiled with considerable care and judgment, and we can
cordially recommend it to our readers as a useful little pocket
companion.”--_Engineering._

* * * * *

_Analysis, Technical Valuation, Purification and Use of Coal Gas._ By the Rev. W. R. BOWDITCH, M.A. With _wood engravings_, 8vo, cloth, 12_s._ 6_d._

Condensation of Gas--Purification of Gas--Light--Measuring--Place
of Testing Gas--Test Candles--The Standard for Measuring
Gas-light--Test Burners--Testing Gas for Sulphur--Testing Gas
for Ammonia--Condensation by Bromine--Gravimetric Method of
taking Specific Gravity of Gas--Carburetting or Naphthalizing
Gas--Acetylene--Explosions of Gas--Gnawing of Gaspipes by
Rats--Pressure as related to Public Lighting, etc.

* * * * *

_Hops, their Cultivation, Commerce, and Uses in various Countries._ By P. L. SIMMONDS. Crown 8vo, cloth, 4_s._ 6_d._

* * * * *

_A Practical Treatise on the Manufacture and Distribution of Coal Gas._ By WILLIAM RICHARDS. Demy 4to, with _numerous wood engravings and large plates_, cloth, 28_s._

SYNOPSIS OF CONTENTS:

Introduction--History of Gas Lighting--Chemistry of Gas
Manufacture, by Lewis Thompson, Esq., M.R.C.S.--Coal,
with Analyses, by J. Paterson, Lewis Thompson, and
G. R. Hislop, Esqrs.--Retorts, Iron and Clay--Retort
Setting--Hydraulic Main--Condensers--Exhausters--Washers
and Scrubbers--Purifiers--Purification--History of Gas
Holder--Tanks, Brick and Stone, Composite, Concrete,
Cast-iron, Compound Annular Wrought-iron--Specifications--Gas
Holders--Station Meter--Governor--Distribution--Mains--Gas
Mathematics, or Formulæ for the Distribution of
Gas, by Lewis Thompson, Esq.--Services--Consumers’
Meters--Regulators--Burners--Fittings--Photometer--Carburization
of Gas--Air Gas and Water Gas--Composition of Coal Gas,
by Lewis Thompson, Esq.--Analyses of Gas--Influence of
Atmospheric Pressure and Temperature on Gas--Residual
Products--Appendix--Description of Retort Settings, Buildings,
etc., etc.

* * * * *

_Practical Geometry and Engineering Drawing_; a Course of Descriptive Geometry adapted to the Requirements of the Engineering Draughtsman, including the determination of cast shadows and Isometric Projection, each chapter being followed by numerous examples; to which are added rules for Shading Shade-lining, etc., together with practical instructions as to the Lining, Colouring, Printing, and general treatment of Engineering Drawings, with a chapter on drawing Instruments. By GEORGE S. CLARKE, Lieut. R.E., Instructor in Mechanical Drawing, Royal Indian Engineering College, Cooper’s Hill. 20 _plates_, 4to, cloth, 15_s._

* * * * *

_The Elements of Graphic Statics._ By Professor KARL VON OTT, translated from the German by G. S. CLARKE, Lieut. R.E., Instructor in Mechanical Drawing, Royal Indian Engineering College, Cooper’s Hill. Crown 8vo, cloth, 5_s._

_See page 3._

* * * * *

_A Practical Treatise on Heat, as applied to the Useful Arts_; for the Use of Engineers, Architects, etc. By THOMAS BOX. _With 14 plates._ Third edition, crown 8vo, cloth, 12_s._ 6_d._

* * * * *

_The New Formula for Mean Velocity of Discharge of Rivers and Canals._ By W. R. KUTTER, translated from articles in the ‘Cultur-Ingenieur.’ By LOWIS D’A. JACKSON, Assoc. Inst. C.E. 8vo, cloth, 12_s._ 6_d._

* * * * *

_Hydraulics of Great Rivers; being Observations and Surveys on the Largest Rivers of the World._ By J. J. REVY. Imp. 4to, cloth, with _eight large plates and charts_, 2_l._ 2_s._

* * * * *

_Practical Hydraulics_; a Series of Rules and Tables for the use of Engineers, etc., etc. By THOMAS BOX. Fifth edition, numerous plates, post 8vo, cloth, 5_s._

* * * * *

_The Indicator Diagram Practically Considered._ By N. P. BURGH, Engineer. _Numerous illustrations_, fifth edition. Crown 8vo, cloth, 6_s._ 6_d._

“This volume possesses one feature which renders it almost
unique; this feature is the mode in which it is illustrated. It
is not difficult to take a diagram if the instrument is once
set, and the setting with stationary engines is occasionally
easy enough, but circumstances continually arise under which the
young engineer is completely at a loss as to how to obtain a
diagram. All uncertainty will be removed by referring to the book
under consideration: here we have drawings of the arrangements
to be adopted under every conceivable circumstance, drawings, we
may add, illustrating the practice of the best engineers of the
day.”--_Engineer._

* * * * *

_Link-Motion and Expansion Gear Practically Considered._ By N. P. BURGH, Engineer. _Illustrated with 90 plates and 229 wood engravings_, small 4to, cloth, 30_s._

* * * * *

_The Mechanician and Constructor for Engineers_, comprising Forging, Planing, Lining, Slotting, Shaping, Turning, Screw Cutting, etc. By CAMERON KNIGHT. _Containing 96 plates, 1147 illustrations, and 397 pages of letterpress._ Cheaper edition, cloth, 18_s._

* * * * *

_The Essential Elements of Practical Mechanics; based on the Principle of Work_, designed for Engineering Students. By OLIVER BYRNE, formerly Professor of Mathematics, College for Civil Engineers. Third edition, _illustrated by numerous wood engravings_, post 8vo, cloth, 7_s._ 6_d._

CONTENTS:

Chap. 1. How Work is Measured by a Unit, both with and without
reference to a Unit of Time--Chap. 2. The Work of Living
Agents, the Influence of Friction, and introduces one of
the most beautiful Laws of Motion--Chap. 3. The principles
expounded in the first and second chapters are applied to the
Motion of Bodies--Chap. 4. The Transmission of Work by simple
Machines--Chap. 5. Useful Propositions and Rules.

* * * * *

_The Practical Millwright’s and Engineer’s Ready Reckoner_; or Tables for finding the diameter and power of cog-wheels, diameter, weight, and power of shafts, diameter and strength of bolts, etc. By THOMAS DIXON. Fourth edition, 12mo, cloth, 3_s._

CONTENTS:

Diameter and Power of Wheels--Diameter, Weight, and Power of
Shafts--Multipliers for Steam used Expansively--Diameters and
Strength of Bolts--Size and Weight of Hexagonal Nuts--Speed
of Governors for Steam Engines--Contents of Pumps--Working
Barrels--Circumferences and Areas of Circles--Weight of Boiler
Plates--French and English Weights and Measures, etc.

* * * * *

_The Principles of Mechanics and their Application to Prime Movers, Naval Architecture, Iron Bridges, Water Supply, etc._ By W. J. MILLAR, C.E., Secretary to the Institution of Engineers and Shipbuilders, Scotland. Crown 8vo, cloth, 4_s._ 6_d._

* * * * *

_A Practical Treatise on Mill-gearing, Wheels, Shafts, Riggers, etc._; for the use of Engineers. By THOMAS BOX. Crown 8vo, cloth, _with 11 plates_, second edition, 7_s._ 6_d._

* * * * *

_Mining Machinery_: a Descriptive Treatise on the Machinery, Tools, and other Appliances used in Mining. By G. G. ANDRÉ, F.G.S., Assoc. Inst. C.E., Mem. of the Society of Engineers. Royal 4to, uniform with the Author’s Treatise on Coal Mining, containing 182 _plates_, accurately drawn to scale, with descriptive text, in 2 vols., cloth, 3_l._ 12_s._

CONTENTS:

Machinery for Prospecting, Excavating, Hauling, and
Hoisting--Ventilation--Pumping--Treatment of Mineral Products,
including Gold and Silver, Copper, Tin, and Lead, Iron, Coal,
Sulphur, China Clay, Brick Earth, etc.

* * * * *

_The Pattern Makers Assistant_; embracing Lathe Work, Branch Work, Core Work, Sweep Work, and Practical Gear Construction, the Preparation and Use of Tools, together with a large collection of Useful and Valuable Tables. By JOSHUA ROSE, M.E. With 250 _illustrations_. Crown 8vo, cloth, 10_s._ 6_d._

* * * * *

_The Science and Art of the Manufacture of Portland Cement_, with observations on some of its constructive applications, _with numerous illustrations_. By HENRY REID, C.E., Author of ‘A Practical Treatise on Concrete,’ etc., etc. 8vo, cloth, 18_s._

* * * * *

_The Draughtsman’s Handbook of Plan and Map Drawing_; including instructions for the preparation of Engineering, Architectural, and Mechanical Drawings. With _numerous illustrations in the text, and 33 plates (15 printed in colours)_. By G. G. ANDRÉ, F.G.S., Assoc. Inst. C.E. 4to, cloth, reduced to 9_s._

CONTENTS:

The Drawing Office and its Furnishings--Geometrical
Problems--Lines, Dots, and their Combinations--Colours, Shading,
Lettering, Bordering, and North Points--Scales--Plotting--Civil
Engineers’ and Surveyors’ Plans--Map Drawing--Mechanical and
Architectural Drawing--Copying and Reducing Trigonometrical
Formulæ, etc., etc.

* * * * *

_The Railway Builder_: a Handbook for Estimating the Probable Cost of American Railway Construction and Equipment. By WILLIAM J. NICOLLS, Civil Engineer. _Illustrated_, full bound, pocket-book form, 7_s._ 6_d._

* * * * *

_Rock Blasting_: a Practical Treatise on the means employed in Blasting Rocks for Industrial Purposes. By G. G. ANDRÉ, F.G.S., Assoc. Inst. C.E. _With 56 illustrations and 12 plates_, 8vo, cloth, 10_s._ 6_d._

* * * * *

_Surcharged and different Forms of Retaining Walls._ By J. S. TATE. Cuts, 8vo, sewed, 2_s._

* * * * *

_A Treatise on Ropemaking as practised in public and private Rope-yards_, with a Description of the Manufacture, Rules, Tables of Weights, etc., adapted to the Trade, Shipping, Mining, Railways, Builders, etc. By R. CHAPMAN, formerly foreman to Messrs. Huddart and Co., Limehouse, and late Master Ropemaker to H.M. Dockyard, Deptford. Second edition, 12mo, cloth, 3_s._

* * * * *

_Sanitary Engineering; a Series of Lectures given before the School of Engineering, Chatham._ Division I. Air.--Division II. Water.--Division III. The Dwelling.--Division IV. The Town and Village.--Division V. The Disposal of Sewage. Copiously illustrated. By J. BAILEY DENTON, C.E., F.G.S., Honorary Member of the Agricultural Societies of Norway, Sweden, and Hanover, and Author of the ‘Farm Homesteads of England,’ ‘Village Sanitary Economy,’ ‘Storage of Water,’ ‘Sewage Farming,’ etc. Royal 8vo, cloth, 25_s._

* * * * *

_Sanitary Engineering_: a Guide to the Construction of Works of Sewerage and House Drainage, with Tables for facilitating the calculations of the Engineer. By BALDWIN LATHAM, C.E., M. Inst. C.E., F.G.S., F.M.S., Past-President of the Society of Engineers. Second edition, _with numerous plates and woodcuts_, 8vo, cloth, 1_l._ 10_s._

* * * * *

_A Practical Treatise on Modern Screw-Propulsion._ By N. P. BURGH, Engineer. _Illustrated with 52 large plates and 103 woodcuts_, 4to, half-morocco, 2_l._ 2_s._

* * * * *

_Screw Cutting Tables for Engineers and Machinists_, giving the values of the different trains of Wheels required to produce Screws of any pitch, calculated by LORD LINDSAY, M.P., F.R.S., F.R.A.S., etc. Royal 8vo, cloth, oblong, 2_s._

* * * * *

_Screw Cutting Tables_, for the use of Mechanical Engineers, showing the proper arrangement of Wheels for cutting the Threads of Screws of any required pitch, with a Table for making the Universal Gas-pipe Threads and Taps. By W. A. MARTIN, Engineer. Second edition, royal 8vo, oblong, cloth, 1_s._

* * * * *

_Treatise on Valve-Gears_, with special consideration of the Link-Motions of Locomotive Engines. By Dr. GUSTAV ZEUNER. Third edition, revised and enlarged, translated from the German, with the special permission of the author, by MORITZ MÜLLER. _Plates_, 8vo, cloth, 12_s._ 6_d._

* * * * *

_Cleaning and Scouring_: a Manual for Dyers, Laundresses, and for Domestic Use. By S. CHRISTOPHER. 18mo, sewed, 6_d._

* * * * *

_A Treatise on a Practical Method of Designing Slide-Valve Gears by Simple Geometrical Construction_, based upon the principles enunciated in Euclid’s Elements, and comprising the various forms of Plain Slide-Valve and Expansion Gearing; together with Stephenson’s, Gooch’s, and Allan’s Link-Motions, as applied either to reversing or to variable expansion combinations. By EDWARD J. COWLING WELCH, Memb. Inst. Mechanical Engineers. Crown 8vo, cloth. 6_s._

* * * * *

_The Slide Valve practically considered._ By N. P. BURGH, Engineer. Ninth edition, _with 88 illustrations_, crown 8vo, cloth, 5_s._

* * * * *

_A Pocket-Book for Boiler Makers and Steam Users_, comprising a variety of useful information for Employer and Workman, Government Inspectors, Board of Trade Surveyors, Engineers in charge of Works and Slips, Foremen of Manufactories, and the general Steam-using Public. By MAURICE JOHN SEXTON. Royal 32mo, roan, gilt edges, 5_s._

* * * * *

_Modern Compound Engines_; being a Supplement to Modern Marine Engineering. By N. P. BURGH, Mem. Inst. Mech. Eng. _Numerous large plates of working drawings_, 4to, cloth, 18_s._

The following Firms have contributed Working Drawings of their
best and most modern examples of Engines fitted in the Royal
and Mercantile Navies: Messrs. Maudslay, Rennie, Watt, Dudgeon,
Humphreys, Ravenhill, Jackson, Perkins, Napier, Elder, Laird,
Day, Allibon.

* * * * *

_A Practical Treatise on the Steam Engine_, containing Plans and Arrangements of Details for Fixed Steam Engines, with Essays on the Principles involved in Design and Construction. By ARTHUR RIGG, Engineer, Member of the Society of Engineers and of the Royal Institution of Great Britain. Demy 4to, _copiously illustrated with woodcuts and 96 plates_, in one Volume, half-bound morocco, 2_l._ 2_s._; or cheaper edition, cloth, 25_s._

This work is not, in any sense, an elementary treatise, or
history of the steam engine, but is intended to describe examples
of Fixed Steam Engines without entering into the wide domain of
locomotive or marine practice. To this end illustrations will be
given of the most recent arrangements of Horizontal, Vertical,
Beam, Pumping, Winding, Portable, Semiportable, Corliss, Allen,
Compound, and other similar Engines, by the most eminent
Firms in Great Britain and America. The laws relating to the
action and precautions to be observed in the construction of
the various details, such as Cylinders, Pistons, Piston-rods,
Connecting-rods, Cross-heads, Motion-blocks, Eccentrics,
Simple, Expansion, Balanced, and Equilibrium Slide-valves, and
Valve-gearing will be minutely dealt with. In this connection
will be found articles upon the Velocity of Reciprocating Parts
and the Mode of Applying the Indicator, Heat and Expansion of
Steam Governors, and the like. It is the writer’s desire to draw
illustrations from every possible source, and give only those
rules that present practice deems correct.

* * * * *

BARLOW’S _Tables of Squares, Cubes, Square Roots, Cube Roots, Reciprocals of all Integer Numbers up to 10,000_. Post 8vo, cloth, 6_s._

* * * * *

CAMUS (M.) _Treatise on the Teeth of Wheels_, demonstrating the best forms which can be given to them for the purposes of Machinery, such as Mill-work and Clock-work, and the art of finding their numbers, translated from the French. Third edition, carefully revised and enlarged, with details of the present practice of Millwrights, Engine Makers, and other Machinists. By ISAAC HAWKINS. _Illustrated by 18 plates_, 8vo, cloth, 5_s._

* * * * *

_A Practical Treatise on the Science of Land and Engineering, Surveying, Levelling, Estimating Quantities, etc._, with a general description of the several Instruments required for Surveying, Levelling, Plotting, etc. By H. S. MERRETT. 41 _fine plates with Illustrations and Tables_, royal 8vo, cloth, third edition, 12_s._ 6_d._

PRINCIPAL CONTENTS: