Servicing projection equipment (1932)

Record Details:

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38 REFLECTOR ARC LAMP 2, Mirror Surface Pits (a) — Small particles thrown off the carbons can cause much damage to the surface, especially so when the carbons are close to the mirror. Metalliccoated carbons are usually a constant source of this trouble. 3. Occasional Aperture Fires Occur When Using Reflector Arc (a) — The arc may be much too close to the front of the lamphouse, thereby giving evidence of light loss. If the light loss is very great, it is evident that the arc has not been adjusted for best results. If the arc has been moved away from the mirror and aperture fires begin, adjust the arc properly. (b) — This may also be due to the sticking of the fire shutter. If fires occur at or near the end of a reel, inspect and clean or adjust the fire shutter.