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 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._ _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 Manufacture of Starch, Glucose, Starch-Sugar, and Dextrine_, based on the German of L. Von Wagner, Professor in the Royal Technical School, Buda Pesth, and other authorities. By JULIUS FRANKEL; edited by ROBERT HUTTER, proprietor of the Philadelphia Starch Works. _With 58 illustrations_, 344 pp., 8vo, cloth, 18_s._ _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. 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. _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. ANDRÉ, F.G.S., Assoc. Inst. C.E. 4to, cloth, 9_s._ CONTENTS: