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Show NEW VACUUM TUBE IS WORLD'S LARGEST CHICAGO. Oct Z. The world's largest vacuum lube, standing three I feet In height and three and one-half one-half inches m diameter at the bottom, bot-tom, has been i ompl-ted in the lab- , oratories of the Western Electric com- pany, officials announce. The tube Is capable of supplying ! 100,000 watts, 200 times the power re-qulred re-qulred for the usual radio broadcast- I ing stations of 100-mile range. The; difficulty in, experiments wn Iq make the "'hob- tuoo alr-llghf and to k the wire for the filament and grid inti the tube while keeping them insulated against about 20,000 volta. After much study the problem was narrowed down to finding a way to make an ilr-tlght joint between the heai'y copper tube which forms Che "plate" and the glass of the upper part of tin; lube and to. bring the heay wires through this glass. Credit for the answer is due W". G. Houskeepcr. a company engineer, who discovered a way to seal copper lo glass which would make an air-tight joint that would not crack at any ordinary or-dinary working temperature. |