Open AccessThe electrical condition of hot surfaces during the adsorption of gases. Part IV.—carbon and copper surfaces at temperatures up to 850° C
Publication year - 1931
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1931.0094
Subject(s) - electrometer , copper , brass , carbon arc welding , materials science , carbon fibers , metallurgy , wax , composite material , adsorption , welding , chemistry , gas metal arc welding , arc welding , composite number , electrical engineering , organic chemistry , engineering
In continuation of the investigation of which an account has been given in Parts I, II and III of this series we have now completed an examination of the electrical condition of hot carbon and copper surfaces. Those previously investigated consisted of gold, silver, nickel and platinum. Carbon and copper were chosen for the experiments to be described below because of their chemical reactivity, and the former especially as a non-metal.Experimental . The apparatus and the experimental method and procedure followed have been previously described in detail. The copper surface consisted of a 6 cm. by 10 cm. sheet of 22 S. W. G. electrolytic copper connected to the electrometer switch by a copper wire welded on to the sheet. A coreless arc carbon rod, 1⋅2 cm. diameter and 25 cm. long, supplied by the General Electric Company, served as the carbon surface. The rod was sealing-waxed into the vertical vessel (Part I, fig. 1) and the protruding portion coated with sealing-wax in order to render the apparatus vacuum tight. The electrometer lead was soldered to a brass terminal screwed into the end of the carbon rod. Both surfaces were cleaned by washing with light petroleum spirit.