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. _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. _With 93 illustrations_, crown 8vo, cloth, 5_s._ _The Principles of Graphic Statics._ By GEORGE SYDENHAM CLARKE, Lieut. Royal Engineers. _With 112 illustrations._ 4to. 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._ _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._ _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, 12_s._ 6_d._