Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 313
ss isknown as Willards method. The other method is founded on the prin-ciple that the mica plates become heated bythe cathode rays and give off a small quantity of gases.Neither of these devices, however, work satisfactorily ; theamount of gases which they transmit to the tube being toosmall to… … Fig. 149. Constancy of tubes 261. The constancy of tubes is the quality they possessof maintaining their vacuum, and this depends greatly uponthe manner in which the vacuum in the tubes has beenproduced. When selecting tubes, it is advisable to getthose, which, when put into operation have a…
Electrical engineering
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