Radio today (Jan-Mar 1939)

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Servicing by touch for 13 years, blind man Cecil Minard of Sandusky, Mich., has built up a thriving radio business. Branley was probably helped in his discovery by the work of Sir Oliver Lodge whom he studied diligently. After Marconi's success in 1895 the story of radio becomes mixed up with driving commercialism and the chronology is as filled with patent litigations, bankruptcies and fierce competition as it is with improvements in the art of radio broadcasting and reception. Proficiency in the art of broadcasting and the birth of the new entertainment are interestingly reported. The amazing growth of broadcasting companies and radio set manufacturers colors the latter part of this century's third decade with excitement that even dizzied the heads of solid visionaries. There's the typical American story of office boy to president, David Sarnoff, now titan of RCA, and the equally unhappy story of Dr. Lee DeForest who seemed to have spent most of his time with his audion tube in either litigation or bankruptcy courts. Encomiums are given to the U. S. Navy department for its recognition of wireless importance, and the policy of giving ambitious inventors money and opportunity to develop radio devices. Big names like Owen D. Young, Gen. James G. Harbord, former President Herbert Hoover and others are brought into play for the important places they filled in the cavalcade of one of the twentieth century's greatest industrial achievements. Although the book is historical and academic, it is easily read. The author's style is engaging, his vocabulary not at all pedantic. He now is writing a history of radio from 1926 to the present. Published by American Historical Society, Inc., New York, N. Y., 421 pages, priced at §4. — H. J. FUNDAMENTALS OF RADIO By Frederick E. Terman * Fundamentals of Radio is an abridged edition of the Terman's well-known Radio Engineering with a simplified treatment so as to make the book more applicable for an introductory course in basic radio principles. The text has been shortened and many problems added for classroom work. Assumption is made that the reader understands at least elementary principles of alternating current and high school mathematics. The subject is covered in an orderly, easily understandable manner. Numerous drawings, charts, and curves supplement the mathematical treatment so as to make the book valuable also to those who are more interested in answers rather than the reasons behind the answers. Besides the principles of radio, chapters devoted to applications of the basic theory to receivers, transmitters, antennas, acoustics, and television are included. It is the reviewer's feeling that Fundamentals of Radio is a must item for the radioman — serviceman or engineer — if he does not have already Terman's Radio Engineering. Price $3.75 — 450 pages. Published by McGraw-Hill Book Co., 330 W. 42nd St., New York, N. Y. — Radio Today. Eveready models 30, 40 High volume oscillation * Check the line voltage making sure that it is not over 110 volts. Adjust the variometer for no oscillation by loosening the mounting screws on the end of the condenser gang shaft and turning its stator. DEPENDABLE RADIO • If we were to show the replacement business of the serviceman as a pie, the failure of the average Fixed Resistor would account for a slice that is more than a quarter of the whole pie. That means, of course, that Old Man Centralab plays an important part in the replacement business. And with a resistor, hard as stone, impervious to moisture, shocks, excessive temperatures, and vibration, the wise serviceman finds it "easy as eatin' pie" to completely satisfy that resistor need with CENTRALAB. Always specify, nay, insist on Centralab at your jobber. 1 TYDF TYPE 310 Baptized in fire at 2500 degrees . . . hard as stone. Center core and ceramic jacket fired together to form a single shock-proof unit. Pure copper covers resistor end for wire lead contact. Centtalab Milwaukee, Wis. Division of Globe Union, Inc. BRITISH CENTRALAB, LTD. Canterbury Rd., Kilburn London N.W. 6, England FRENCH CENTRALAB CO. 118 Avenue Ledru-Rollin Paris XI, France January, 1939 45