Siemens V 140/8G Mö Kenotron

     14” (35 cms) long. Early oil immersed kenotron. Dating probably to the thirties. Note the shape of this kenotron, inspired from that of  earlier air-cooled kenotrons and early hot cathode x-ray tubes. Its shape is equally reminiscent of the early PANTIX, the first Siemens rotating anode x-ray tube introduced in 1933.