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heavy steel construction used in self-supporting towers. Founda- tions of an ordinary tower the same height would be many times larger than the 12-foot scjuare concrete base which supports the 90 tons of steelwork. RCA also has installed a new FM antenna for KXBC atop San Bruno Mountain, highest point on the San Francisco peninsula. Taking to the air last October, KNBC-FM's new equipment increases the station's effective radiated power from 3.000 watts to 45,000 watts. With 15 times more power and enjoying the highest elevation in the area, KNBC has gained countless thousands of new FM listeners. The FM transmitter is housed in an all-concrete, spacious single- story building which overlooks the entire bay area. KXBC-FM shares the structure with KRON-TV, San Francisco's third television outlet, and also RCA-equipped. The site of the KRON-KNBC building and the TV and FM towers has become known as TV Peak. PYLON ANTENNA OF KNBC'S FM STATION ABOUT TO BE LIFTED INTO POSI- TION ATOP SA.N BRUNO MOUNTAIN, HIGHEST POINT ON THE PENINSULA. MASTER CONTROL ROOM OF TELEVISION STATION KRON-TV WITH VIDEO MONITORS IN REAR AND TRANSCRIPTION TURNTABLES IN FOREGROUND. Electrons Detect Stray Coins Stray coins mailed in envelopes with box-tops and soap wrappers, during contests staged by adver- tisers, are being spotted at one contest headquarters through the use of'RCA's Electronic Metal De- tector. At the office of Associated Activi- ties Inc. of Minneapolis nationally- known advertising service organ- ization, the RCA instrument is used to screen the mountains of mail received in premium promo- tions as final insurance that no coin has escaped the sorters. This measure, says the firm, retrieves each month many dollars that might otherwise be lost to the advertiser, with resultant confusion and delay in the mailing of premiums to con- sumers. It isn't so much the value of the lost coins that concerns the contest promoters as the much greater loss in customer goodwill through de- layed mailing of the premiums. Coins clipped or taped to a bo.x-top or wrapper may become detached and remain in the envelope. To guard against loss of such coins, all mail, after sorting, is passed through an aperture in the metal detector on a continuous belt. The entrance of a coin into the electro- magnetic field generated within this aperture causes a change in the field, activating a mechanism which diverts the coin-bearing envelope into a separate receptacle. Film Operators Attend Course in Theatre TV Tliirty motion-picture projection- ists, employed by theatres in Man- hattan. l!rooklyn, Albany, Chicago, Los Angeles, Queens ^'illage, X. Y., and other cities, have completed a special theatre television training course conducted by the RCA Serv- ice Company at Camden, X. J. The trainees will be in charge of the R(^A theatre TV etiuipments that are to be installed in ten cities this fall. fI4 RADIO AGE]