154 



tion as well as the application of the 

 names Marconi, Braun and Wien suc- 

 cessively to the three types, is perhaps 

 open to criticism. Radio frequency al- 

 ternators of Fessenden and Goldschmidt, 

 and the arc senders of Poulsen and Lo- 

 renz, form the subjects of the next two 

 chapters. The tenth chapter, on the 

 propagation of waves over the earth's 

 surface, contains much interesting mate- 

 rial as to the effects of earth resist- 

 ance and capacity and of atmospheric 

 changes. Chapters XI and XII describe 

 the operation of detectors and receiving 

 arrangements for both damped and sus- 

 tained waves. The last two chapters are 

 on directive transmission and radiotel- 

 ephony, respectively. Some notes on 

 progress up to 1912, a series of useful 



Popular Science Monthly 



tables, a bibliography and set of notes 

 on theory and a very full index complete 

 the book. 



This American edition is especially 

 well printed and sets a high mark to be 

 reached by other technical publications. 

 As a reference work alone, recording 

 and describing accomplishments in the 

 radio arts, the book should be extremely 

 useful to radio-engineers. As a text for 

 a thorough course in both theory and op- 

 eration of radio instruments its value 

 can scarcely be overrated. Since the 

 treatment is almost entirely a matter of 

 facts undisputed by real authorities, the 

 tendency to favor German workers on 

 historical points may easily be over- 

 looked in view of the importance of 

 their technical work. 



Radio Club News 



Schenectady Radio Association 



THE Schenectady Radio Associa- 

 tion, which was formerly known 

 as the Amateur Wireless Association, 

 held its annual election of officers in 

 September, with results as follows : R. 

 Denham, president; H. Vogel, vice- 

 president ; L. Pohlman, secretary ; S. 

 Dodd, assistant secretary ; E. Kurth, 

 treasurer, and A. LeTarte, librarian. 



The association meets every Thurs- 

 day night in the High School building, 

 where it has a i K.W. outfit. The un- 

 official call letters are S. R. A. The As- 

 sociation welcomes any visitors who wish 

 to attend its meetings, and would like to 

 correspond with other similar clubs and 

 persons interested in the radio field. 



The association is also planning to 

 send representatives to New York city, 

 to meet members of other organizations 

 and would like to hear from them. 



Cincinnati School Radio Society 



The East Night High School Radio 

 Society was organized with a member- 

 ship of 52 amateurs and students of the 

 school, in October, 191 5. Officers 

 elected at the first meeting were Wm. G. 

 Finch, President; C. H. Fender, Secre- 



tary ; Professor Frantz, Treasurer. It 

 is proposed to install a modern 5 kw. ra- 

 dio set, and thus to train the membership 

 into a thorough knowledge of radio op- 

 erating conditions. The secretary, who 

 may be addressed in care of the school, 

 Cincinnati, Ohio, will be glad to hear 

 from the members of other nearby 

 organizations. 



Bronx Radio Club 



At the last meeting of the Bronx 

 Radio Club of New York, election of 

 new ot^cers was held. The results were 

 as follows : 



M. Haber, President; H. Berlin, 

 Secretary; J. Smith, Vice-president; A. 

 Richter, Treasurer ; A. Schoy, Business 

 Manager. 



A lecture was delivered by one of the 

 members on "The Theory of Wireless 

 Transmission." Lectures are given at 

 every meeting, by the more advanced 

 members of the club, dealing with timely 

 topics of wireless or electrical interest. 

 The club will be glad to communicate 

 with other clubs and individuals, desir- 

 ous of having information or particulars 

 of the proceedings of the club. All com- 

 munications should be addressed to the 

 Secretary, 705 Home St., Bronx, N. Y, 



