Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

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FOR MANAGERS AND OPERATORS 299 Figure 125. by very careful adjust A b ment of the carbons, and maintained by exercising watchful care. D shows a condition Where the lower carbon tip has been advanced a little too much with relation to the upper one, so that the front edge of the lower crater is built up until it shuts off a large portion of the light emanating from! the upper crater. This condition, too, must be carefully guarded against. The only remedy for condition E, Fig. 124, is to burn a long arc until the saw teeth are burned off. The only remedy for condition D, Fig. 124, is to alter the relation of the carbons by shoving the top carbon tip ahead slightly, or pulling the lower one back. When using D. C. the careless operator who allows his arc to become too short may find the tip of his lower carbon crowned with a sort of mushroom — a cap having a slim stem. This cap is composed of graphite. It is caused by keeping the carbons too close together, so that the arc does not get sufficient air properly to volatize the carbon. Under these conditions the carbon particles carried from the crater are deposited on the top of the negative carbon in the form of graphite. Graphite has high resistance, and will withstand enormous