Abstract
Analyses of arcs between plain soot carbons of various degrees of purity were carried out with a quartz spectrograph. The normal vertical two-electrode arc and also a horizontal three-electrode arc of Y form, with two negative carbons and one positive, were used, parts of the arc flame only being photographed. The object was to find a correlation between the spectra and the candle-power per ampere of the positive crater of the three-electrode arc. The effects on the spectra of the following changes in conditions are given: (i) changing the positive carbon while keeping the negative carbons the same; (ii) special purification of the carbons; (iii) sputtering of the arc; (iv) photographing different parts of the arc (a) close to the positive carbon, (b) centre of the arc flame, (c) close to the negative carbons. Photographic enlargements of the ultra-violet parts of the spectra are given.
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