Transactions of the Society of Motion Picture Engineers (1925)

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High Intensity Arc—Benfon 73 arc practice, and the carbon gas is given off with a relative high velocity. This is a vital feature, for the proper maintenance of the arc depends upon the strength and stability of this stream of carbon ^'^ Fig. 2. — Typical craters. mill Fig. 3. — Craters when electrodes are improperly adjusted. gas. It has been found that the lamp may be placed on its side or inverted, and the negative gas maintains an invariable relation to the two electrodes.