. The Bell System technical journal . ^ Fig. 5—The 715A vacuum tube. of the control-grid and screen-grid supports. The plate is molybdenumwith zirconium coating on its outside surface. This coating was employedto increase the thermal emissivity of the plate in the interest of a low operat-ing temperature. It also serves to absorb some gas. The cathode, heaterand grid terminals of the tube were brought out in the moulded-glass 4-Pin 826 BELL SYSTEM TECHNICAL JOURNAL 16

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1