Transactions of the Society of Motion Picture Engineers (1925)

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High Intensity Arc — Benford 77 above has a long history in the development of the mechanism. The original lamps had an alcohol burner under each electrode for several inches back from the arc, and the non-oxidizing alcohol flame served as a protection against the oxygen of the air. But alcohol introduced too much of a complication in military service, and other ways were devised to obtain almost the same resistance to oxidation. Fig. 7. — A high intensity studio light complete with switches jyid rheostat. Adjustment of Electrodes The reason for the care taken in adjusting the electrodes of the high intensit}^ arc is obvious when we remember that the light source is the small volume of gas contained within the crater. The light is bright or dim according as the crater is full or empty, and the steadi