. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . the anti-cathode, of which a type is shown inFig. 11, are durable and practical tubes. Many devices havebeen suggested for regulating the vacuum of the tube. Vari-ous salts, rich in oxygen, as oxide of manganese, or chlorate ofpotash, which may be decomposed upon the passage of anelectrical discharge, are used, thereby increasing the volumeof gas within the tube, thus lowering the vacuum. The adjustable tube shown in Fig. 10 possesses the uniquecharacteristic that it mav be raised or lowered at wil
. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . the anti-cathode, of which a type is shown inFig. 11, are durable and practical tubes. Many devices havebeen suggested for regulating the vacuum of the tube. Vari-ous salts, rich in oxygen, as oxide of manganese, or chlorate ofpotash, which may be decomposed upon the passage of anelectrical discharge, are used, thereby increasing the volumeof gas within the tube, thus lowering the vacuum. The adjustable tube shown in Fig. 10 possesses the uniquecharacteristic that it mav be raised or lowered at will of the i78 STATIC ELECTRICITY. operator. The tube is blown from Thuringian glass. Themanner of the adjustment of the tube is shown in the accom-panying cuts. A glass partition separates the compartmentsA and C, so that the regulating devices work independentlyof each other. To lower- the vacuum of the tube attach thecathode conducting cord of the main tube to the auxiliarycathode C. Turn on the current carefully and almost instantlythe desired results will have been obtained. To raise the. Fig. io.—A Type ol Adjustable Tube and Cut of Regulating Device. vacuum, attach the anode conducting-cord of the main tubeto the auxiliary anode A. Turn on the current for from fiveto ten minutes or until the desired vacuum is obtained. Another device is the employment of a metal, a part of whichprojects within, which, upon being heated, evolves and setsfree hydrogen. Another method is the use of a capillary valve,so constructed as to let in a slight quantity of air upon revolv-ing a closely fitting plug placed in one side of the tube. These various devices serve a practical purpose until the X-RAY APPARATUS. 179 chemical properties of the salts or metals are exhausted. Theobjection to the capillary valve is that it is liable to becomeopened, and unceremoniously admit air, thereby reducing thevacuum below the point that the X-ray can be produced.
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