Chapter III: Section I: On the Equality and Distribution of Forces--Section II

Resistance of Timber--Section III. Construction of Floors--Section
IV. Construction of Roofs--Section V. Construction of Domes and
Cupolas--Section VI. Construction of Partitions--Section VII.
Scaffolds, Staging, and Gantries--Section VIII. Construction of
Centres for Bridges--Section IX. Coffer-dams, Shoring, and
Strutting--Section X. Wooden Bridges and Viaducts--Section XI.
Joints, Straps, and other Fastenings--Section XII. Timber.

_The Builder's Clerk_: a Guide to the Management of a Builder's Business. By THOMAS BALES. Fcap. 8vo, cloth, 1_s._ 6_d._

_Our Factories, Workshops, and Warehouses_: their Sanitary and Fire-Resisting Arrangements. By _B. H. Thwaite_, Assoc. Mem. Inst. C.E. _With 183 wood engravings_, crown 8vo, cloth, 9_s._

_Gold_: Its Occurrence and Extraction, embracing the Geographical and Geological Distribution and the Mineralogical Characters of Gold-bearing rocks; the peculiar features and modes of working Shallow Placers, Rivers, and Deep Leads; Hydraulicing; the Reduction and Separation of Auriferous Quartz; the treatment of complex Auriferous ores containing other metals; a Bibliography of the subject and a Glossary of Technical and Foreign Terms. By _Alfred G. Lock_, F.R.G.S. _With numerous illustrations and maps_, 1250 pp., super-royal 8vo, cloth, 2_l._ 12_s._ 6_d._

_Iron Roofs_: Examples of Design, Description. _Illustrated with 64 Working Drawings of Executed Roofs._ By ARTHUR T. WALMISLEY, Assoc. Mem. Inst. C.E. Second edition, revised, imp. 4to, half-morocco, 3_l._ 3_s._

_A History of Electric Telegraphy_, to the Year 1837. Chiefly compiled from Original Sources, and hitherto Unpublished Documents, by J. J. FAHIE, Mem. Soc. of Tel. Engineers, and of the International Society of Electricians, Paris. Crown 8vo, cloth, 9_s._

_Spons' Information for Colonial Engineers._ Edited by J. T. HURST. Demy 8vo, sewed.

No. 1, Ceylon. By ABRAHAM DEANE, C.E. 2_s._ 6_d._

CONTENTS:

Introductory Remarks--Natural Productions--Architecture and
Engineering--Topography, Trade, and Natural History--Principal
Stations--Weights and Measures, etc., etc.

No. 2. Southern Africa, including the Cape Colony, Natal, and the
Dutch Republics. By HENRY HALL, F.R.G.S., F.R.C.I. With Map. 3_s._
6_d._

CONTENTS:

General Description of South Africa--Physical Geography with
reference to Engineering Operations--Notes on Labour and Material
in Cape Colony--Geological Notes on Rock Formation in South
Africa--Engineering Instruments for Use in South Africa--Principal
Public Works in Cape Colony: Railways, Mountain Roads and Passes,
Harbour Works, Bridges, Gas Works, Irrigation and Water Supply,
Lighthouses, Drainage and Sanitary Engineering, Public Buildings,
Mines--Table of Woods in South Africa--Animals used for Draught
Purposes--Statistical Notes--Table of Distances--Rates of Carriage,
etc.

No. 3. India. By F. C. DANVERS, Assoc. Inst. C.E. With Map. 4_s._
6_d._

CONTENTS:

Physical Geography of India--Building Materials--Roads--Railways--
Bridges--Irrigation--River Works--Harbours--Lighthouse Buildings--
Native Labour--The Principal Trees of India--Money--Weights and
Measures--Glossary of Indian Terms, etc.

_A Practical Treatise on Coal Mining._ By GEORGE G. ANDRE, F.G.S., Assoc. Inst. C.E., Member of the Society of Engineers. _With 82 lithographic plates._ 2 vols., royal 4to, cloth, 3_l._ 12_s._

_A Practical Treatise on Casting and Founding_, including descriptions of the modern machinery employed in the art. By N. E. SPRETSON, Engineer. Third edition, with 82 _plates_ drawn to scale, 412 pp., demy 8vo, cloth, 18_s._

_The Depreciation of Factories and their Valuation._ By EWING MATHESON, M. Inst. C.E. 8vo, cloth, 6_s._

_A Handbook of Electrical Testing._ By H. R. KEMPE, M.S.T.E. Fourth edition, revised and enlarged, crown 8vo, cloth, 16_s._

_Gas Works_: their Arrangement, Construction, Plant, and Machinery. By F. COLYER, M. Inst. C.E. _With 31 folding plates_, 8vo, cloth, 24_s._

_The Clerk of Works_: a Vade-Mecum for all engaged in the Superintendence of Building Operations. By G. G. HOSKINS, F.R.I.B.A. Third edition, fcap. 8vo, cloth, 1_s._ 6_d._

_American Foundry Practice_: Treating of Loam, Dry Sand, and Green Sand Moulding, and containing a Practical Treatise upon the Management of Cupolas, and the Melting of Iron. By T. D. WEST, Practical Iron Moulder and Foundry Foreman. Second edition, _with numerous illustrations_, crown 8vo, cloth, 10_s._ 6_d._

_The Maintenance of Macadamised Roads._ By T. CODRINGTON, M.I.C.E, F.G.S., General Superintendent of County Roads for South Wales. 8vo, cloth, 6_s._

_Hydraulic Steam and Hand Power Lifting and Pressing Machinery._ By FREDERICK COLYER, M. Inst. C.E., M. Inst. M.E. _With 73 plates_, 8vo, cloth, 18_s._

_Pumps and Pumping Machinery._ By F. COLYER, M.I.C.E., M.I.M.E. _With 23 folding plates_, 8vo, cloth, 12_s._ 6_d._

_Pumps and Pumping Machinery._ By F. COLYER. Second Part. _With 11 large plates_, 8vo, cloth, 12_s._ 6_d._

_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. _With 10 plates_, crown 8vo, cloth, 7_s._ 6_d._

_The Municipal and Sanitary Engineer's Handbook._ By H. PERCY BOULNOIS, Mem. Inst. C.E., Borough Engineer, Portsmouth. _With numerous illustrations_, demy 8vo, cloth, 12_s._ 6_d._

CONTENTS:

The Appointment and Duties of the Town Surveyor--Traffic--
Macadamised Roadways--Steam Rolling--Road Metal and Breaking--
Pitched Pavements--Asphalte--Wood Pavements--Footpaths--Kerbs and
Gutters--Street Naming and Numbering--Street Lighting--Sewerage--
Ventilation of Sewers--Disposal of Sewage--House Drainage--
Disinfection--Gas and Water Companies, etc., Breaking up Streets--
Improvement of Private Streets--Borrowing Powers--Artizans' and
Labourers' Dwellings--Public Conveniences--Scavenging, including
Street Cleansing--Watering and the Removing of Snow--Planting
Street Trees--Deposit of Plans--Dangerous Buildings--Hoardings--
Obstructions--Improving Street Lines--Cellar Openings--Public
Pleasure Grounds--Cemeteries--Mortuaries--Cattle and Ordinary
Markets--Public Slaughter-houses, etc.--Giving numerous Forms
of Notices, Specifications, and General Information upon these
and other subjects of great importance to Municipal Engineers and
others engaged in Sanitary Work.

_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.

_Elements of Construction for Electro-Magnets._ By Count TH. DU MONCEL, Mem. de I'lnstitut de France. Translated from the French by C. J. WHARTON. Crown 8vo, cloth, 4_s._ 6_d._

_Practical Electrical Units Popularly Explained_, with _numerous illustrations_ and Remarks. By JAMES SWINBURNE, late of J. W. Swan and Co., Paris, late of Brush-Swan Electric Light Company, U.S.A. 18mo, cloth, 1_s._ 6_d._

_A Treatise on the Use of Belting for the Transmission of Power._ By J. H. COOPER. Second edition, _illustrated_, 8vo, cloth, 15_s._

_A Pocket-Book of Useful Formulae 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. _With numerous illustrations_, 744 pp. Twenty-first edition, revised and enlarged, 32mo, roan, 6_s._

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 Formulae--Canals,
Sewers, Waterworks, Docks--Irrigation and Breakwaters--Gas,
Ventilation, and Warming--Heat, Light, Colour, and Sound--Gravity:
Centres, Forces, and Powers--Millwork, 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 Formulae.

_Hints on Architectural Draughtsmanship._ By G. W. TUXFORD HALLATT. Fcap. 8vo, cloth, 1_s._ 6_d._

_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. Ninth edition, 64mo, roan, gilt edges, 1_s._; or in cloth case, 1_s._ 6_d._

This work is printed in a pearl type, and is so small, measuring
only 2-1/2 in. by 1-1/4 in. by 1/4 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 2-1/2 in. by 1-1/4
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._

_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.' New Edition, _with 59 woodcuts and 5 plates_, 8vo, cloth, 15_s._

_Notes on Concrete and Works in Concrete_; especially written to assist those engaged upon Public Works. By JOHN NEWMAN, Assoc. Mem. Inst. C.E., crown 8vo, cloth, 4_s._ 6_d._

_Electricity as a Motive Power._ By Count TH. DU MONCEL, Membre de l'Institut de France, and FRANK GERALDY, Ingenieur des Ponts et Chaussees. Translated and Edited, with Additions, by C. J. WHARTON, Assoc. Soc. Tel. Eng. and Elec. _With 113 engravings and diagrams_, crown 8vo, cloth, 7_s._ 6_d._

_Treatise on Valve-Gears_, with special consideration of the Link-Motions of Locomotive Engines. By Dr. GUSTAV ZEUNER, Professor of Applied Mechanics at the Confederated Polytechnikum of Zurich. Translated from the Fourth German Edition, by Professor J. F. KLEIN, Lehigh University, Bethlehem, Pa. _Illustrated_, 8vo, cloth, 1_2s._ 6_d._

_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 Re-polishing. Third edition, royal 32mo, sewed, 6_d._

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

_The Principles of Graphic Statics._ By GEORGE SYDENHAM CLARKE, Capt. Royal Engineers. _With 112 illustrations._ 4to, cloth, 12_s._ 6_d._

_Dynamo-Electric Machinery_: A Manual for Students of Electro-technics. By SILVANUS P. THOMPSON, B.A., D.Sc., Professor of Experimental Physics in University College, Bristol, etc., etc. Second edition, _illustrated_, 8vo, cloth, 12_s._ 6_d._

_Practical Geometry, Perspective, 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, Capt. R.E. Second edition, _with 21 plates_. 2 vols., cloth, 10_s._ 6_d._

_The Elements of Graphic Statics._ By Professor KARL VON OTT, translated from the German by G. S. CLARKE, Capt. R.E., Instructor in Mechanical Drawing, Royal Indian Engineering College. _With 93 illustrations_, crown 8vo, cloth, 5_s._

_A Practical Treatise on the Manufacture and Distribution of Coal Gas._ By WILLIAM RICHARDS. Demy 4to, with _numerous wood engravings and 29 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 Formulae 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.

_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._

_The Practical Millwright 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._

_Tin_: Describing the Chief Methods of Mining, Dressing and Smelting it abroad; with Notes upon Arsenic, Bismuth and Wolfram. By ARTHUR G. CHARLETON, Mem. American Inst. of Mining Engineers. _With plates_, 8vo, cloth, 12_s._ 6_d._

_Perspective, Explained and Illustrated._ By G. S. CLARKE, Capt. R.E. _With illustrations_, 8vo, cloth, 3_s._ 6_d._

_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 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, _with 148 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.

_Breweries and Maltings_: their Arrangement, Construction, Machinery, and Plant. By G. SCAMELL, F.R.I.B.A. Second edition, revised, enlarged, and partly rewritten. By F. COLYER, M.I.C.E., M.I.M.E. _With 20 plates_, 8vo, cloth, 18_s._

_A Practical Treatise on the Construction of Horizontal and Vertical Waterwheels_, specially designed for the use of operative mechanics. By WILLIAM CULLEN, Millwright and Engineer. _With 11 plates._ Second edition, revised and enlarged, small 4to, cloth, _12s._ 6_d._

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

_Mining Machinery_: a Descriptive Treatise on the Machinery, Tools, and other Appliances used in Mining. By G. G. ANDRE, 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.

_Tables for Setting out Curves for Railways, Canals, Roads, etc._, varying from a radius of five chains to three miles. By A. KENNEDY and R. W. HACKWOOD. _Illustrated_, 32mo, cloth, 2_s._ 6_d._

_The Science and Art of the Manufacture of Portland Cement_, with observations on some of its constructive applications. _With 66 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. ANDRE, F.G.S., Assoc. Inst. C.E. 4to, cloth, 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 Formulae, etc., etc.

_The Boiler-maker's and Iron Ship-builder's Companion_, comprising a series of original and carefully calculated tables, of the utmost utility to persons interested in the iron trades. By JAMES FODEN, author of 'Mechanical Tables,' etc. Second edition revised, _with illustrations_, crown 8vo, cloth, 5_s._

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

_Painting and Painters' Manual_: a Book of Facts for Painters and those who Use or Deal in Paint Materials. By C. L. CONDIT and J. SCHELLER. _Illustrated_, 8vo, cloth, 10_s._ 6_d._

_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._

_Laxton's Builders' and Contractors' Tables_; for the use of Engineers, Architects, Surveyors, Builders, Land Agents, and others. Bricklayer, containing 22 tables, with nearly 30,000 calculations. 4to, cloth, 5_s._

_Laxton's Builders' and Contractors' Tables._ Excavator, Earth, Land, Water, and Gas, containing 53 tables, with nearly 24,000 calculations. 4to, cloth, 5_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._

_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. 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, oblong, cloth, 1_s._, or 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._

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

_A Glossary of Terms used in Coal Mining._ By WILLIAM STUKELEY GRESLEY, Assoc. Mem. Inst. C.E., F.G.S., Member of the North of England Institute of Mining Engineers. _Illustrated with numerous woodcuts and diagrams_, 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. Second edition, royal 32mo, roan, gilt edges, 5_s._

_Electrolysis_: a Practical Treatise on Nickeling, Coppering, Gilding, Silvering, the Refining of Metals, and the treatment of Ores by means of Electricity. By HIPPOLYTE FONTAINE, translated from the French by J. A. BERLY, C.E., Assoc. S.T.E. _With engravings._ 8vo, cloth, 9_s._

_Barlow's Tables of Squares, Cubes, Square Roots, Cube Roots, Reciprocals of all Integer Numbers up to 10,000._ Post 8vo, cloth, 6_s._

_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, Semi-portable, 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.

_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. Fourth edition, revised by G. W. USILL, Assoc. Mem. Inst. C.E. _41 plates, with illustrations and tables_, royal 8vo, cloth, 12_s._ 6_d._

PRINCIPAL CONTENTS: