Radio broadcast .. (1922-30)

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RADIO BROADCAST ADVERTISER 75 * The Type "C" has a tuning characteristic which ap- proaches straight fre- quency at min- im u m and straight wave- length at max- imum. Priced from $4.00 up. The Type "C" Card well Condenser is almost the uni- versal selection of Radio Engineers and Editors who want the best. Mr. John B. Brennan used them in the New Radio Broadcast "Lab" circuit. .. . Mr. E. M. Sargent recommends the 317-C as the only condenser for the "Infra- dyne" .... The "A. C. Varion," which you can build to work direct from the light- ing fixtures, uses the 217-C. . . . For Short Wave Reception, Cardwell Condensers have always been accepted as the only practical instrument. "THE STANDARD OF COMPARISON" r*r\ \\ir T? mm RDna