Abstract

In the present investigation opposing magnetic fields are applied to the free burning carbon arc with a silicate sample (granodiorite) in its anode crater. The magnetic field promoted the selective volatilization of the elements present in the sample. As a result, a depression in the spectral line intensities of Mn, Ti, Th, and Fe as well as the background was observed. At the same time the intensity of the spectral lines of Ag, Ge, Pb, In, and Cu is enhanced. The latter elements are of great significance since they are used as pathfinders for gold.

Effect of Alkali and Alkaline Earth Chlorides on the Anode Temperature of the dc Arc*

Bert L. Vallee and Ralph E. Thiers
J. Opt. Soc. Am. 46(2) 83-86 (1956)

Effects of Inert Gases on dc Arc Discharge

Bert L. Vallee and S. James Adelstein
J. Opt. Soc. Am. 45(1) 63_1-63 (1955)

The Influence of Extraneous Elements on Line Intensity. IV. Extraneous Element Effects in the Direct-Current Arc*

Wallace R. Brode and Donald L. Timma
J. Opt. Soc. Am. 39(6) 478-481 (1949)

The Zeeman Effect in the Rhodium Arc Spectrum at High Fields

Julius P. Molnar and William J. Hitchcock
J. Opt. Soc. Am. 30(11) 523-535 (1940)

Anode Temperatures and Characteristics of the dc Arc in Noble Gases*†

Bert L. Vallee and Milton R. Baker
J. Opt. Soc. Am. 46(2) 77-82 (1956)