390 Sciiiitijic Intelligence. 



Electrical Apparatus ; by Frederick Bedell, assisted by C. A. 

 PlEBCE. Pp. xiii, 860. New York, 1911 (I). Van Nostrand 

 Co.).— The first edition of the present work (see this Journal, 

 vol. xxix, page 83) was issued under the title " Direct and 

 Alternating Current Testing." The second edition avoids cer- 

 tain omissions made in the first and includes discussions of induc- 

 tion motors and generators, synchronous motors and converters, 

 and wave analysis. Chapter XI, on wave analysis, is very con- 

 cise and ends with two appendices dealing with the origin, proof 

 and use of Range's method of analysis. "In a restricted sense 

 the book is now complete." h. s. it. 



10. Applied Electrochemistry ; by M. de Kay Thompson. 

 Pp. xii, 329; 137 figures. New York, 1911 (The Macmillan Co.). 

 — This is the first English text-book in which an attempt has been 

 made to cover the whole field of electro-chemistry. Consequently 

 it seems desirable to quote the headings of the chapters in order 

 to give an idea of the scope of the work in as concise a manner 

 as possible. The titles are: — "I, Coulometers or Voltameters ; 

 II, Electrochemical Analysis ; III, Electroplating, Electrotyping, 

 and the Production of Metallic Objects ; IV, Electrolytic Win- 

 ning and Refining of Metals in Aqueous Solutions ; V, Elec- 

 trolytic Reduction and Oxidation ; VI, Electrolysis of Alkali 

 Chlorides ; VII, The Electrolysis of Water; VIII, Primary Cells; 

 IX, The Lead Storage Battery ; X, The Edison Storage Batlery ; 

 XI, The Electric Furnace ; XII, Products of the Resistance and 

 Arc Furnace ; XIII, The Electrometallurgy of Iron and Steel ; 

 XIV, The Fixation of Atmospheric Nitrogen ; XV, The Produc- 

 tion of Ozone." 



The plan adopted in this book has been to discuss each 

 subject from the theoretical and from the technical point of view 

 separately. In the former part a knowledge of theoretical 

 chemistry is assumed. Numerous references to English, French, 

 and German scientific journals are given so that the volume 

 should be useful as a reference book as well as a text. A pleas- 

 ing feature of the work is afforded by the full-page reproductions 

 of photographs of the interiors of manufacturing plants, of elec- 

 tric furnaces, etc. In addition to the tables of electrochemical 

 data, the appendix also contains full details of the legal electrical 

 units. h. s. u. 



11. Der electrische Lichtbogen ; by Hermann Th. Simon. 

 Pp. 52, 31 figures, 1 plate. Leipzig, 1911 (S. Hirzel).— This little 

 book is a formal account of an experimental lecture delivered in 

 January, 1911, before the Scientific Society of Berlin. The 

 material is presented in a very interesting and semi-popular 

 manner. Twenty-two demonstration experiments are explained 

 in fine print. The colored plate, representing the appearance of 

 an arc between carbon electrodes, is the best picture of the 

 subject which the writer of this notice has seen. h. s. u. 



