The envelopes in order to discharge tubes in a gaseous atmosphere year silica glass, and method of manufacturing said

摘要

733,978. Discharge lamps. HERAEUS QUARZSCHMELZE GES. Oct. 5, 1953 [March 25, 1953], No. 27248/53. Class 39 (1). [Also in Group XXIII] A case for a gas-discharge lamp is made of quartz glass of a degree of purity greater than that required for transmitting the required amount of radiation. The greater purity gives a longer working life.