A Practical Manual On Sea Water Distillation
With A Description Of The Necessary Machinery For The Process

ELECTRICAL ENGINEERING. 47 ______________________ __________________________ In Large Crown 8vo. Handsome Cloth. With 222 Illustrations. 5s. net. TELEGRAPHIC SYSTEMS, AND OTHER NOTES. A Handbook of the Principles on which Telegraphic Practice is Based. By ARTHUR CROTCH, of the Engineer-in-Chief’s Department, G.P.O. Contents. — Batteries, Primary and Secondary. — Universal Battery Working.— Duplex Telegraphy. — Duplex and Quadruples Telegraphy. —Automatic Telegraphy.— Multiplex Telegraphy.—The Hughes Type Printing Instrument.—The Baudot System.— The Murray Type Printing Telegraph.—Test and Battery Boxes.—Circuit Concentration, &c. — Repeaters. — Submarine Telegraphy.—Wireless Telegraphy.—Index. — List of Diagrams of Connections. “ This book is a particularly good one . . . we can thoroughly recommend it . . . a handy book of ready reference.”—Electrical Review. “The treatise will be of much help to the telegraph engineer, and to the student in his preparatory training and it can be thoroughly recommended.”—Electrician. ___________________________ Nineteenth Edition. Leather, Pocket Size, with 8io pages. 8s. 6d. A POCKET-BOOK OF ELECTRICAL RULES & TABLES FOR THE USE OF ELECTRICIANS AND ENGINEERS. By JOHN MUNRO, C.E., & Prof. JAMIESON, M.Inst.C.E., F.R.S.E. “ Wonderfully Perfect. . . . Worthy of the highest commendation we can jive it.”—Electrician. _______________________________ GRIFFIN’S ELECTRICAL PRICE-BOOK: For Electrical, Civil, Marine, and Borough Engineers, Local Authorities, Architects, Railway Contractors, &c. Edited by H. J. Dowsing. SecondEdition. 8s. 6d. ______________________________ ELECTRIC SMELTING AND REFINING. ELECTRO METALLURGY, A Treatise on. ELECTRICAL PRACTICE IN COLLIERIES. ELECTRICAL SIGNALLING IN MINES. [See p. 67 General Cat. [See p. 67 ,, [See p. 57 ,, [Zn Active Preparation. _____ In Large Crown 8vo. Handsome Cloth. ELECTRICAL THEORY AND THE PROBLEM OF THE UNIVERSE. By G. W. DE TUNZELMANN, B.Sc., London, Member of the Institute of Electrical Engineers ; formerly Professor of Natural Philosophy and Astronomy, H.M.S. “ Britannia,” Dartmouth. Contents. — Fundamental Electrical Phenomena. — Units and Measurement. — Meaning and Possibility of a Mechanical Theory of Electricity.—The Ether.—Ine Ether as a Framework of Reference for Motion.—The Relations between Ether and Moving Matter.—Electric Conduction in Gases. The Faraday-Maxwell Theory.—The Electron Theory.—Magnetism and the Dissipation of Energy.—Contract Electrification and Electrolysis.—Metallic Conduction. Optical Phenomena. -The Mechanism of Radiation. -General Phenomena of Radio Activity.—Transmutations of Radio-Active Substances. -Ages of the Sun and Earth.—The Solar Carona, The Aurora, ami Comets Tails.— Radio-Activity in Stars and Nebulæ.—Arrangement and Number of Atoms in a Mole- cule.—Changes in the Aspect of Fundamental Mechanical Principals. —Gravitation and Cohesion.-—The Place of Mind in the Universe.—Mathematical and other Appen- dices.—Index. __________ ________________________ LONDON: CHARLES GRIFFIN & CO.. LIMITED. EXETER STREET, STRAND. ____________________________