A system providing semiautomatic arc-gap control for emission spectrography is described. Motor-driven electrode-carrying arms of an arc-spark stand are positioned according to signals derived from phototransistors located in the image plane of the arc gap produced by a cylindrical lens. The circuitry is applicable to other stands.
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References
1.
BuyanovN. A., Zavodskaya Lab., 9, No. 1, 69–72 (1940).
