| 摘要 |
458,668. Discharge lamps. QUARZLAMPEN GES., 1, Frankfurter Landstrasse, Hanau-on-Main, Germany. May 15, 1935, No. 14279. Convention date, May 15, 1934. Drawings to Specification. [Class 39 (i)] [See also Group XX] An apparatus for examining objects by ultra-violet light comprises a high-pressure mercury vapour lamp, the envelope of which is transparent to ultra-violet rays but opaque to visible rays ; the lamp has preferably oxide electrodes and a rare gas filling.
|
