Page:Popular Science Monthly Volume 88.djvu/182

 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,

�� �