_Elements of Construction for Electro-Magnets._ By Count TH. DU MONCEL, Mem. de l’Institut de France. Translated from the French by C. J. WHARTON. Crown 8vo, cloth, 4_s._ 6_d._ _Electro-Telegraphy._ By FREDERICK S. BEECHEY, Telegraph Engineer. A Book for Beginners. _Illustrated._ Fcap. 8vo, sewed, 6_d._ _Handrailing: by the Square Cut._ By JOHN JONES, Staircase Builder. Fourth edition, _with seven plates_, 8vo, cloth, 3_s._ 6_d._ _Handrailing: by the Square Cut._ By JOHN JONES, Staircase Builder. Part Second, _with eight plates_, 8vo, cloth, 3_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._ _Philipp Reis, Inventor of the Telephone_: A Biographical Sketch. With Documentary Testimony, Translations of the Original Papers of the Inventor, &c. By SILVANUS P. THOMPSON, B.A., Dr.Sc., Professor of Experimental Physics in University College, Bristol. _With illustrations_, 8vo, cloth, 7_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 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. _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 Formulæ—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 Formulæ. _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. Fifth 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 2½ in. by 1¾ in. by ¼ in. thick, that it may be easily carried in the waistcoat pocket.