A Statement of the Principles on which a Saving of Steam can be best effected, by Frank Salter, B.Sc., crown 8vo 3 6 =Electrical Standards=. Reports of the Committee on Electrical Standards appointed by the British Association, revised by Sir W. Thomsom, Dr. J. P. Joule, Professors Clark, Maxwell, and Fleeming Jenkin, with a Report to the Royal Society on Units of Electrical Resistance, by Prof. F. Jenkin, edited by Professor Fleeming Jenkin, F.R.S., _plates_, 8vo, cloth 9 0 =Electric Telegraph.= Electrical Tables and Formulæ for the Use of Telegraph Inspectors and Operators, compiled by Latimer Clark and Robert Sabine, _with wood engravings_, crown 8vo, cloth 12 6 =Engineering.= Spons' Dictionary of Engineering, Civil, Mechanical, Military, and Naval, with technical terms in French, German, Italian, and Spanish, 3100 pp., and _nearly_ 8000 _engravings_, super-royal 8vo, in 8 divisions, cloth 13_s._ 6_d._ each £5 8 0 8 " half-morocco £6 8 0 8 " French morocco £7 4 0 Complete in 3 vols., cloth £5 5 0 Bound in a superior manner, half-morocco, top edge gilt, 3 vols. £6 12 0 =Engineers' Companion.= The Office and Cabin Companion for Engineers and Officers of Steam Vessels, consisting of observations, rules, and tables to facilitate such Calculations as Naval Officers and Engineers are called upon to make, by J. Simond Holland, second edition, 12mo, cloth 3 0 =Engineering Drawing.= An Elementary Treatise on Orthographic Projection, being a new Method of Teaching the Science of Mechanical and Engineering Drawing, intended for the Instruction of Engineers, Architects, Builders, Smiths, Masons, and Bricklayers, and for the use of Schools, _with numerous illustrations on wood and steel_, by William Binns, Associate Institute Civil Engineers, late Master of the Mechanical Drawing Class at the Department of Science and Art, and at the School of Mines, formerly Professor of Applied Mechanics, at the College for Civil Engineers, etc., eighth edition, 8vo, cloth 9 0 _Mr. Binns' system of Mechanical Drawing is in successful operation in all the Art Schools of the United Kingdom._ =Engineering Drawing.=