. Röntgen ray diagnosis and therapy . es with a special vacuum. The strong tubes described below aregenerally not to be used in connection with them. The best staticmachines are made in theUnited States. The Interrupter.—With theintroduction of the electro-lytic interrupter by Wehneltthe technic became greatlysimplified. This apparatus,invented by Spottiswoode andmodified by Wehnelt, gives amost powerful secondary dis-charge, the break of the cir-cuit being very rapid. The principle of its con-struction is that a small plat-inum wire is passed througha porcelain tube, from thesealed end of whi
. Röntgen ray diagnosis and therapy . es with a special vacuum. The strong tubes described below aregenerally not to be used in connection with them. The best staticmachines are made in theUnited States. The Interrupter.—With theintroduction of the electro-lytic interrupter by Wehneltthe technic became greatlysimplified. This apparatus,invented by Spottiswoode andmodified by Wehnelt, gives amost powerful secondary dis-charge, the break of the cir-cuit being very rapid. The principle of its con-struction is that a small plat-inum wire is passed througha porcelain tube, from thesealed end of which its tipprojects into an aqueous solution (10 per cent) of sulphuric acid(Fig. 6). (The regulation of the extent of the exposure of theplatinum surface will be explained further below in connectionwith the handling of the tubes—p. 32.) A. lead cathode of a large surface is immersed into the samefluid, through which the current is sent. The efficiency of the appa-ratus is due to the rapid break caused by the sudden generation of. Fig. 6.—Simple Wehnelt Interrupter. 14 THE KONTGEN KAYS an envelope of non-conducting gas (hydrogen and oxygen) aroundthe platinum tip. As the expression of the formation of detonat-ing gas continuous explosioisn are perceived. The number ofbreaks varies with the amount of the platinum area exposed, andmay reach 10,000 per minute. The large amount of secondaryenergy liberated permits of very short exposures. The fluid is contained in a thick glass jar, the cover of whichconsists of hard rubber. It carries the wires, and is perforatedin order to permit the escape of the gas. To prevent the collection of gas the interrupter should notbe kept in a closet. Explosion of the accumulated gas may ignitethe closet. The terminus must be connected with the positivepole of the supply circuit, while the lead plate carries the nega-tive wire. Non-observance of this rule is followed by the burn-ing of the platinum tip. If the interrupter stops on accountof a
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