a ae, 
it is in itself not particularly attractive. The causes which induced me to begin the investigation 
of this matter were manifold, and I venture to hope that an exposition ot them will not be with- 
out general interest, 
Lodge—WIRELESS TELEGRAPHY.—SIGNALLING ACROSS 
SPACE WITHOUT WIRES. By Sir Oliver J. Lodge, D.Sc., F.R.S. New and 
Enlarged Edition. Second Issue. Very fully illustrated. Price 5s, nett., post free 5s. 3d. 
The new edition forms a complete Illustrated Treatise on Hertzian Wave Work. The Full 
Notes of the interesting Lecture delivered a the Author before the Royal Institution in June, 
1894, form the first chapter of the book. The second chapter is devoted to the Application of 
Hertz Waves and Coherer Signalling to Telegraphy, wile Chapter III. gives Details of other 
Telegraphic Developments. In Chapter IV. a history of the Coherer Principle is given, including 
Professor Hughes’ Early Observations before Hertz or Branly, and the work of M. Branly. 
Chapters are also devoted to ‘‘ Communications with respect to Coherer Phenomena ona Large 
Scale,” the “ Photo-Electric Researches of Drs, Elster and Geitel,’’ and the Photo-Electric 
Researches of Prof, Righi. . 
Phillips—THE BIBLIOGRAPHY OF X-RAY LITERATURE 
AND RESEARCH. Being a carefully and accurately compiled Ready Reference Index 
to the Literature on Réntgen or X-Rays. Edited by Charles E. S, Phillips. With an 
Historical Retrospect and a Chapter, ‘‘ Practical Hints,” on X-Ray work by the Editor. 
Price 5s., post free. 
Ram—THE INCANDESCENT LAMP AND ITS MANU- 
eee oe By Gilbert S. Ram. Fully Illustrated. Price 7s. 6d. post free. Mew 
Raphael—THE LOCALISATION OF FAULTS IN ELECTRIC 
LIGHT MAINS, By F. Charles Raphael. New Edition. Price 7s. 6d. nett. 
Although the localisation of faults in tele; rep cables has been dealt with fully in several 
hand-books and pocket-books, the treatment of e ty electric light and power cables has never 
been discussed in an equally comprehensive manner. The conditions of the problems are, 
however, very different in the two cases; faults in telegraph cables are seldom localised before 
their resistance has become low compared with the resistance of the cable itself, while in electric 
light work the contrary almost always obtains. This fact alone entirely changes the method of 
treatment required in the latter case, and it has been the Author’s endeavour, by dealing with the 
matter systematically, and as a separate subject, to adequately fill a gap which has hitherto 
existed in technical literature. 
The various methods of insulation Wii ee working have been collected and discussed, 
as these tests may be considered to belong to the subject. 
Raphael—WIREMAN’S POCKET-BOOK. A Manual for the 
Wiring Contractor, the Mains Superintendent and the Wireman. Edited by F. Charles 
Raphael. Price 5s. nett., post free 5s. 3d. 
Eprror’s Note.—When the preparation of this Pocket-Book was commenced, the original 
intention of its Editor was to collect in a handy and useful form such Tables, Instructions and 
Memoranda as would be useful to the Electric Light Wireman in his work. Thishas been carried 
out in Section A of the Pocket Book in its present form. During the past few years, however, 
many enquiries have been received for a good book of reference with regard to the laying of 
underground mains, and with matters connected with insulated conductors generally. It was 
decided, therefore, to extend greatly the area covered by the book, and to treat the whole subject 
of erecting and laying electrical and conducting systems in such a manner that the tables, 
diagrams and let‘erpress might be useful to engineers in charge of such work, as well as to the 
wireman, jointer, and foreman. In fact, the section on Underground work has been compiled 
largely with a view to meeting the requirements of Mains Superintendents, Central Station 
Engineers and those occupied in designing networks. 
In addition to the tables, instructions and other detailed information as to cables, ducts, 
junction boxes, &c., contained in the section on Underground Mains, it has been deemed advisable 
to add a chapter briefly describing the various systems employed for public distributing networks. 
In this, the essential practical information is alone given; two and three-phase systems are dealt 
with, as well as continuous current and single phase, and the method of calculating the size of 
the conductors and the fall of pressure from the number of lamps or horse-power of motors is 
made clear without the elaboration of clock-face diagrams or algebraical exercises. 
Diagrams for the connections of telephones are given in Section D, including those for 
subscribers’ instruments on the new Post Office exchange system in London ; and it is belicved 
that neither these diagrams nor those for bell connections have hitherto been published together 
in convenient peckst-Ficok form. The various conversion factors in the Miscellaneous Section 
and the arrangement of the wages table are those with which the Editor has himself found the 
most useful in practice. 
Snell—ELECTRIC MOTIVE POWER. By Albion T. Snell, 
Assoc.M.Inst.C.E., M.I.E.E. Over 400 pages, nearly 250 illustrations. Price ros. 6d., 
post free; abroad, 11s. ew edztion, z904. 
The rapid spread of electrical work in collieries, mines and elsewhere has created a demand 
for a practical book on the subject of transmission of power. Though much had been written, 
“ THE ELECTRICIAN” PRINTING & PUBLISHING CO.,, LTD., 
I, 2 and 3, Salishury Court, Fleet Street, London, E.C, 
