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ated are for tally lights only), and a new magnetic disc recorder which will record 70 seconds at 45 rpm. They were also demonstrating their studio vidicon camera and a color camera and showing the RCA color video tape recorder transport mechanism. Sarkes- Tarzian had complete film and live studio control equipment set up and in operation. There were many other exhibitors displaying lighting, transmitting, studio, control and accessory equipment. The 12th Annual NAB Broadcast Engineering Conference session occupied two-and-a-half days of the four-day meeting where an excellent program of papers covering AM, FM and TV subjects were pre¬ sented. Due to lack of space, the broadcasting equip¬ ment was exhibited at both the Statler and Biltmore Hotels. t)ue to this geographical separation and also due to the fact that there were several exhibition rooms at each hotel as well as exhibits in hotel rooms, as we look back we find we did not locate some of them. Since the Video Recording Workshop began the following Sunday, our time at NAB was neces¬ sarily shortened. * * * * 45 - Following the workshop we spent four days at the IERT in Columbus. This year, the equipment display was larger than the previous year. ITA— Industrial Transmitters and Antennas—was demon¬ strating a 10-watt fm transmitter as well as displaying 50-watt and 250-watt fm transmitters. Motorola was showing its new “Classroom 21,” a TV receiver de¬ veloped especially for classroom use. This receiver is designed both for “off-the-air” or rf reception as well as to accept video and audio feeds from a closed circuit studio without modification. It is provided with a custom designed stand on wheels, featuring an adjustable tilt to minimize reflections as well as a separate 8-inch speaker to provide excellent sound quality from the front. Dage Division of Thompson products was demon¬ strating a newly designed miniature TV camera, Model 333. It is completely automatic with no oper¬ ating controls and self contained in a case (without optics) 2 %" x 5%" x The camera is of modular construction and weighs approximately four pounds. It operates on 10 watts power input from practically any source and its output is composite video or modu¬ lated rf, or both as required, with standard RETMA sync, 525 lines, 60 fields per second, pictures fully in¬ terlaced, or other special sweep rates, as required. Other exhibitors included Tele-Cam, Inc. of Pittsburgh whose equipment WQED used in the pro¬ duction of the Encyclopedia Brittanica Science Series; RCA, showing their TK-15 vidicon camera equip¬ ment; Sarkes-Tarzian with a complete live and film studio control set-up; Zenith showing AM, FM and TV receivers; Century Lighting, Teleprompter, Na¬ tional Theatre Supply demonstrating the new GPL vidicon equipment; and DuMont with a display of in¬ dustrial TV equipment for educational use. To complete the list of exhibitors, there were dis¬ plays by WOSU-TV, NBC and NAEB, as well as promotional materials and descriptive literature from many educational radio and television stations. JUNE 1958 5