_The Gas Consumer’s Handy Book._ By WILLIAM RICHARDS, C.E. _Illustrated._ 18mo, sewed, 6_d._ _Steam Pleating for Buildings_; or, Hints to Steam Fitters, being a description of Steam Heating Apparatus for Warming and Ventilating Private Houses and large Buildings; with Remarks on Steam, Water, and Air in their relation to Heating; to which are added miscellaneous Tables. By J. W. BALDWIN, Steam Heating Engineer. _With many illustrations._ Second edition, crown 8vo, cloth, 10_s._ 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. _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.