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798
HANDBOOK OF PROJECTION FOR
POWERS IMPROVED HIGH INTENSITY LAMP.— The
Powers Division of the International Projector Corporation has taken over the manufacture of the General Electric High Intensity Arc Lamp, described on pages 790 to 797, under a special licensing agreement. Many improvements have been made on the lamp, which is now a genuine Powers product, called the Powers Improved High Intensity Lamp.
Basically the improved lamp is the same as the one described pages 790 to 797, and the description and instructions there printed apply broadly to both lamps.
However, the improvements are important, see figures 303, 304 and 305, hence a descripion of them is necessary, as well as amended instructions covering them.
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Figure 303
The positive contacts of the new lamp, instead of being made of a solid piece of metal as heretofore, now consist of two heavy contact blocks, HT-52, Fig. 304, each of which is held in a stamped sheet metal holding arm, Fig. HT-56. The contact blocks are readily removable from the holding arms. When worn out they can be replaced at a moderate cost. Instead of a single compression spring at the lower end of the contact arms, formerly used on the G. E. lamp, two compression springs, HT-204, Fig. 304, are provided so as to evenly distribute the pressure of the blocks against the positive carbon along their entire contact surfaces. The current is conducted directly from the positive carbon clamp to the contact blocks