Abstract

A detailed study has been made of the electrical characteristics and light-modulation properties of a 90-watt cesium vapor arc having a three-inch column. The range of frequencies used extend from 100 to 106 c.p.s. When operated on a d.c. biasing current of 5 amp., the arc has a positive resistance; below 20,000 c.p.s. its reactance is inductive, while above this frequency the reactance is chiefly capacitative. The modulation ratio for the resonance lines at 8521A and 8944A has a nearly constant value of 0.85 below 2000 c.p.s., and for higher frequencies varies inversely with the square root of the frequency.

© 1947 Optical Society of America

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