_CONTENTS.—Introductory Remarks—The Production of Electricity—The Voltaic Arc—Division of the Electric Light—Machines or Generators—Power required, and Motors—Application of the Electric Light—Choice of a System—Electrical Measurement—Cost of Working—Result of Various Installations—Measurement of Light and Current—Storage of Electricity and Transmission of Power—Conclusion—Useful Tables and Memoranda._ _The Graphic_, “At the present time, when the question of illumination by electricity is fully under discussion, a third edition of Mr. Killingworth Hedges’ _Useful Information on Electric Lighting_ is doubly welcome. The little work is now fully brought up to date, and gives a plain, straightforwardly written account of the various forms of the arc and incandescent lamps, and, indeed, of the general system of electric lighting. Thus a very fair idea of the principle may be gathered by the general reader, who will find it a welcome companion when visiting the Electrical Exhibition, while the manufacturer in search of a practicable light for his workshop will gain valuable information from the various hints conveyed in its pages. To the scientific student also the work will be exceedingly useful, if only from the handy memoranda and tables in the appendix. _Altogether the book is the best of the kind that we have yet seen_, and we cannot refrain from hoping that Mr. Killingworth Hedges may see fit to bring out a more compendious and detailed work on the subject, with which he is so eminently competent to deal.” _Also, by the same Author, demy 8vo. Illustrated, 32 pp. Paper. Price 1s._ The Supply of Electricity by Local Authorities. READ AT THE ANNUAL MEETING OF THE ASSOCIATION OF MUNICIPAL ENGINEERS AND SURVEYORS, OXFORD, 1883. All Mr. Hedges’ books are sent post free on receipt of postal order, by the GLOBE ELECTRICAL AND ENGINEERING COMPANY, Supply Stores, 7, Carteret Street, Westminster, S.W. THE BARNSLEY CARBON COMPANY. Wholesale Manufacturers of PURE CARBON POINTS, CANDLES, AND BATTERY PLATES OF EVERY DESCRIPTION. CARBON CUTTERS AND GRINDERS. CARBON WORKS: =BARNSLEY, YORKSHIRE=. LONDON OFFICE: 7, Carteret Street, Westminster, S.W. J. EDMUNDSON & CO., LIMITED, Engineers & Electricians, 19, GREAT GEORGE ST., WESTMINSTER, S.W.