Semi-Automatic Arc Gap with a Motorized Stand

Abstract

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.

Emission Spectroscopy

“…Kerwin (189) gives a detailed review' of developments since 1947 with particular emphasis on design and techniques in the ion source and analyzer regions. Barnard (15) refers to some outstanding problems in ion source behavior and describes recent WOrk utilizing a mass spectrometer constructed with extreme care to mechanical details.…”