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or remote studios. The station has also issued a new brochure cover¬ ing the WTTW-TV Recording Service which includes sample video recording costs. Revenue from the re¬ cording service is applied to the operation of WTTW. ***** A new line of closed circuit vidicon television equipment has just been announced by the General Precision Laboratory, Inc., Pleasantville, N. Y. The model PD-250 camera incorporates a five-inch elec¬ tronic viewfinder, a four-lens turret and either port¬ able or rack-mounted control equipment. For studio installations a control console is available, equipped with a 14-inch picture monitor, a five-inch waveform monitor and rack mounted control unit with remote control panel. The PD-250 camera is priced at $1,750 and operates from an external RETMA sync or an in¬ ternal sync generator. Where budget requirements are restrictive, the model PD-250 camera priced at $1,250 is self contained and provides either video or RF output. It is equipped with a three lens turret as standard equipment but has no viewfinder. ***** Glen Southworth, chief engineer of KWSC, the State College of Washington at Pullman, is the author of an article on page 100 of the February 14 elec¬ tronics. The article outlines a method of determining optimum electronic focus of television cameras and film chains by a special bar chart and by adjusting focus controls for maximum response of peaks on the waveform monitor. This chart, developed by Mr. Southworth, also permits rapid determination of the system resolution and relative resolving power of dif¬ ferent camera lenses. ***** February 1958 Electronic Industries contains a re¬ port on progress achieved by the EIA Committee, Microwave Relay Systems for Communication (TR- 14) on “Standardizing Microwave Communication Systems.” Due to the many and varied uses of micro- wave systems, it has been found necessary to stand¬ ardize the various units and to arrive at a glossary of terms to best describe the microwave communication process. By reference to these standards it may be possible for buyers to simplify the specification of complete systems. The article was written by Tre¬ vor Clarke, former chairman of the above committee. ***** WRFK-FM at the Union Theological Seminary, Richmond 27, Va. is increasing power to one kilowatt. They wish to purchase used frequency and modula¬ tion monitors for this transmitter. If any of our readers have these available please contact Mr. R. W. Kirkpatrick at WRFK-FM. WHRM, Wausau, of the Wisconsin State Broad¬ casting Service, is installing a new RCA 8-bay FM an¬ tenna on a new 600-foot tower being erected by WSAU-TV. The FM antenna is a gift to the state of Wisconsin Valley Television, Inc. and is being in¬ stalled at about the 500-foot level on the tower. The added antenna height is expected to extend the WHRM secondary coverage by 15 miles and add per¬ haps 25 per cent to the area served with a satisfac¬ tory FM signal, acording to Jack Stiehl, chief en¬ gineer of the Wisconsin State Broadcasting Service. It is also expected that shadow areas or dead spots within the present coverage contours will be elimi¬ nated. MARCH 1958 5