. Radiography, X-ray therapeutics and radium therapy . now in use. Whenthese very hard tubes are used the high tension transformer, such as the 270 RADIATION THERAPEUTICS Snook machine, will be found extremely useful. The control of the tubeswhen using the unidirectional current obtained from this type of transformer is a matter of comparative Interrupter.—A con-denser is necessary when theinterrupter is of the mercury-jettype, as is also a condenserbattery when the apparatus isused for many hours daily. Thebattery should be arranged sothat it is convenient to quicklychange from one s
. Radiography, X-ray therapeutics and radium therapy . now in use. Whenthese very hard tubes are used the high tension transformer, such as the 270 RADIATION THERAPEUTICS Snook machine, will be found extremely useful. The control of the tubeswhen using the unidirectional current obtained from this type of transformer is a matter of comparative Interrupter.—A con-denser is necessary when theinterrupter is of the mercury-jettype, as is also a condenserbattery when the apparatus isused for many hours daily. Thebattery should be arranged sothat it is convenient to quicklychange from one set of con-densers to another. The mercury jet interrupterhas already been described, seepage 17, and little more need beadded here. The best di-electricto employ is coal gas ; a supplypipe with a tap being run fromthe main to the apparatus,to which a length of rubbertubing is attached, and this iscarried to the inlet tap on theinterrupter. Before turning onthe main switch to the appar-atus, the gas should be allowedIt is a good practice to apply a. Fig. 189.—Mercury interrupter with(Schall.) ?as di-electric. to flow freely through the interrupter light to the outlet tap, and allow the gas to burn for a few minutes in order to expel all air from the interior. It is important to see that the
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