Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 136
t for vacuum.The cuts figs. 100-101 both show this latter device, which consists of a sidepocket containing a substance from which, by use of a match or spiritlamp, vapor may be driven off to reduce the vacuum where this shallhave become too high. The device is efficient and is the next best… … Fig. 1(J(>. W6030. Thomson Double-Focus Tube. 132
Electric apparatus and appliances · Equipment and supplies
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