Elementary treatise on electricity and magnetism : founded on Joubert's "Traité élémentaire d'électricité" (1909)
Foster, G. Carey (George Carey), Porter, Alfred William, 1863-1939, Joubert, Jules François · London : Longmans · leaf 27
J^ … Fig. 4. Fig. 5. flint-glass and ebonite are among the most efficient and convenientfor practical purposes. Glass, however, is apt to become coveredwith a conducting film of moisture deposited from the atmosphere.This can sometimes be prevented by keeping it slightly warm—not hot, as it then…
Electricity · Magnetism
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
