. Radiography, X-ray therapeutics and radium therapy . able amountof work has to be done it is well to thoroughly inspect the break at leasttwice a week and clean the jets out. DIPPER INTERRUPTER 271 Some makers claim for their interrupter that cleaning is only necessaryonce in six months, but this is quite a mistake. Careful cleaning at shortintervals facilitates harmonious working of apparatus. Other forms of interrupters may be used, of these the best being theelectrolytic. This break, if properly adjusted, will be found useful. It isthe easiest of all interrupters to work with, requires ve
. Radiography, X-ray therapeutics and radium therapy . able amountof work has to be done it is well to thoroughly inspect the break at leasttwice a week and clean the jets out. DIPPER INTERRUPTER 271 Some makers claim for their interrupter that cleaning is only necessaryonce in six months, but this is quite a mistake. Careful cleaning at shortintervals facilitates harmonious working of apparatus. Other forms of interrupters may be used, of these the best being theelectrolytic. This break, if properly adjusted, will be found useful. It isthe easiest of all interrupters to work with, requires very little cleaning, andhardly any attention beyond an occasional adjustment; it has the furtheradvantage that the variations are greater. With an adjustable primary andtwo or more points in the interrupter, it gives a wide range of using very hard tubes it is necessary to get a relatively large currentin the primary. This it is possible to obtain by using a thick platinumpoint. A tachymeter may also be used when desired, see Fig. Fig. 191.—Dipping interrupter with revolution counter or tachymeter. Dipping: Interrupter with Counter, for Regulating- TherapeuticDoses.—The interrupter illustrated above is designed chiefly for may be used for other therapeutic purposes of X-rays ; it is arrangedto give a dosage measured by a definite number of interruptions in theprimary circuit. For this purpose a dipper mercury interrupter is employed,the turbine forms not being sufficiently definite, it being difficult toaccurately register every interruption on the counter. The axle of themotor is directly connected with the counter, which is provided with anindicator and dial. The indicator is set to the number of interruptionsthe exposure is to consist of, and the interrupter switched on. When theindicator reaches zero the exposure is automatically terminated by thecurrent being cut off by a relay switch. There is a timepiece on the circuit,and the exposu
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