Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

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April, 1930] RADIATION CHARACTERISTICS 411 consists of a mercury arc operating between tungsten electrodes and in parallel with a tungsten filament. A small pool of mercury close IZ /o 8 £/?£& 300V TO zeoo 3ZOOA 70 3OOO O JO ZO 3O 4O SO 6O 7O SO 9O /OO LfiMP VOLTS FIG. 7. Volt-energy characteristic of Uviarc at constant current. under the filament insures a mercuryvapor saturated arc enclosure or the forming and maintenance of the arc. The fact that this arc unctions without moving or auxiliary parts makes it stand apart If. /o 8 6 ^ 2 n /9T7e. 6 VOLTS /^ p 3000 rb 3ZOO/ / ja<^K \^\ a a oo ro 30 00 A o / a 3 4 s LfiMF* rtMF>£f?£S FIG. 8. Current-energy characteristic of Uviarc at constant voltage. from all other arcs, and challenges the old saying that there is nothing new under the sun. The bulb of the lamp is made of one of the glasses that absorb the energy below 2800 A. and at the same time has a high transparency