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THIS MACHINE SEALS A PIECE OF GLASS TUBING TO THE TOP OF EACH MINIATUKK TUBE SO THAT AIR AND GASSES INSIDE THE ENVELOPE MAY BE EXHAUSTED. ing tubes according to the old lamp manufacturing practice: a large glass bulb with the elements mounted inside in spacious gran- deur, like fish in a bowl. But the electrodes, unsupported at the top of the bulb, often shifted in posi- tion, thereby short-circuiting and otherwise ruining the tube. Break- ing with tradition, RCA tube en- gineers fixed a round piece of mica at the top of the electrode mount and reshaped the glass bulb so that the mica shouldered against it, an- choring the electrodes firmly. A few years later—in 1935— along came the metal tube. Its effect also was to cut down the size of standard receiving tubes. At this point, the obstacle to further reduction in the size of tubes ap- peared to be the metal stem. It also offered a difficult production problem in that each of the tube leads required its separate glass insulator. These insulators had to be welded to a special alloy eyelet, and each eyelet had to be welded to the stem. This process involved the welding of as many as 17 tiny, separate parts. In 1938, RCA tube engineers found the answer. This was the button stem. The large stem was reduced to a little glass pancake surrounded by a metal ring, permitting the tube wires to run directly through it without the need for special insulators, eyelets, etc. Now the true miniature tube could be fashioned, and soon it came into existence in the development lab- oratories of the RCA plant at Har- rison, N. J. NBC EXECUTIVES MAKE NATIONWIDE TOUR Following the opening session in New York, NBC representatives headed by President Niles Tram- mell and Executive Vice President Frank E. Mullen entrained March 13 for a nationwide tour during which they discussed problems of the broadcasting industry with sta- tion representatives in Chicago, At- lanta, Dallas and Los Angeles. Three-day meetings were held in each city. In addition to Trammell and Mul- len, the group included William S. Hedges, John F. Royal, Frank M. Russell, C. L. Menser, Ken R. Dyke. Easton C. Woolley. Hugh M. Beville, Charles P. Hammond. Sydney H. Eiges and Sheldon B. Hickox, Jr. AGEING RACKS WHERE RCA MINIATURE TUBES ARE "SEASONED" BEFORE PACK- AGING FOR SHIPMENT. [RADIO AGE 251 MACHINE SPRAYS MAGNESIUM OVER SMALL PIECES OF MICA USED FOR IN- SULATORS IN MINIATURE TUBES.