Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 464
minium, because they are not liable to anychange, while gold and platinum cathodes seem tovolatilise, depositing a film on the glass of the tubewhere they are carried with the stream of molecules.This has a double disadvantage: the glass becomesmore opaque to X-rays, and the film occludes… … Fig. 183. has a condensing action on the air, preventing itsthorough removal by the pump. This condensation isovercome by the heat. A very modern tube is theone shown in Fig. 183. It is a biaTwdic double bulb CHAP. XIV.] ELECTRICITY AND MAGNETISM. 439 focus tube. The subsidiary bulb gives an…
Electricity · Magnetism
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