Physics
Scientific paper
Nov 1948
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1948phrv...74.1524c&link_type=abstract
Physical Review, vol. 74, Issue 10, pp. 1524-1530
Physics
32
Scientific paper
New measurements of the area of the arc cathode spot from measurements of width of tracks left on metals by a cathode spot moving in a magnetic field indicate that the current density is greater than values given by previous workers. At 2.6 amperes, we find the following values in air at atmospheric pressure: Cu 124,000 amp./cm2, Al 29,500 amp./cm2, W 74,000 amp./cm2, Hg on Cu 20,700 amp./cm2. The Cu, Al, and W electrodes were first oxidized in a bunsen flame. For an arc burning in mercury vapor with a mercury cathode at a few microns pressure we find at 2.6 amperes a current density of 50,000 to 220,000 amperes per cm2. Values at currents above 5 amperes could not be obtained because of the formation of multiple spots.
Cobine J. D.
Gallagher J. C.
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