. The principles and practice of roentgenological technique . ^;l!l!llt- B A Fig. 87.—Coolidge tube circuit B is the storage bat-tery, A is the ammeter, R is the rheostat forregulation of the battery current. The doublewires go to the cathode end of the tube. Mis the milliamperemeter. possible and in such a way that it can be easilyread from the operating position. If the polarity of the machine is wrong, it. Fig. 88.—Storage battery arrangement for Coolidgetube with attachment for charging. When theextension to the right is placed vertically thebattery charges. (Waite and Bartlett). will be s
. The principles and practice of roentgenological technique . ^;l!l!llt- B A Fig. 87.—Coolidge tube circuit B is the storage bat-tery, A is the ammeter, R is the rheostat forregulation of the battery current. The doublewires go to the cathode end of the tube. Mis the milliamperemeter. possible and in such a way that it can be easilyread from the operating position. If the polarity of the machine is wrong, it. Fig. 88.—Storage battery arrangement for Coolidgetube with attachment for charging. When theextension to the right is placed vertically thebattery charges. (Waite and Bartlett). will be shown by the fact that the milliam-meter will register no current, regardless ofhow high the filament temperature may be. Before the tube can be energized it is neces-sary to heat the filament. 70 ENERGIZATION OF COOLIDGE TUBE No discharge current through the tube cantake place unless the filament is heated,and the amount of discharge current whichmay be passed into the tube is determined pri-marily by the degree of heating of the fila-ment. If the temperature of the filament is low,only a small number of electrons escape fromit and, consequently, only a small dischargecurrent can be sent through the tube. Themaximum current for each particular filamenttemperature is called the saturation currentwhich means that all the electrons are beingutilized as fast as they are produced. Increas-ing the impress
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
