. The American journal of roentgenology, radium therapy and nuclear medicine . operated by means of the push-buttons 14and 15, each of which is attached to a flex-ible diaphragm in the side wall of the metalcontainer. For greater flexibility, pieces ofSylphon tubing, 16 and 17, are used in placeof flat diaphragms. The inner surface ofeach flexible diaphragm rests against theend of one of the push-rods. One push-button then serves to increasethe filament current and, hence, the milli-amperage flowing through the tube, whilethe other serves to lower it. 9. The Control Box.—This is, with a fewcha
. The American journal of roentgenology, radium therapy and nuclear medicine . operated by means of the push-buttons 14and 15, each of which is attached to a flex-ible diaphragm in the side wall of the metalcontainer. For greater flexibility, pieces ofSylphon tubing, 16 and 17, are used in placeof flat diaphragms. The inner surface ofeach flexible diaphragm rests against theend of one of the push-rods. One push-button then serves to increasethe filament current and, hence, the milli-amperage flowing through the tube, whilethe other serves to lower it. 9. The Control Box.—This is, with a fewchanges, like one which has already beendescribed in a paper on apparatus for port- /(? 20 Z/ I AAAAAA I. Fig. 7. ries the receptacle into which the cathodebase of the tube screws. The rheostat con-tact arm, 10, and the two ratchet wheels, 11and 19, are rigidly connected together androtatably mounted on a horizontal teeth of the two ratchet wheels point inopposite directions. The metal fingers 12 and13 are made of flat spring material and arecarried by the bakelite push-rods 9 and of these fingers engages with one ofthe ratchet wheels. If one of the push-rods,9, for example, is alternately pushed andreleased, it produces a clock-wise rotationof the rheostat contact-arm 10. A similar useof the other push-rod results in counter-clock-wise rotation of 10. The push-rods are Fig. work. It is shown in Fig. 10 and con-tains an auto-transformer with a multiplicityof taps and corresponding special switch. Bymeans of this combination it is possible tovary the voltage supplied to the .r-ra}- trans-former by steps of 2 volts through a rangeof 32 volts. The voltage delivered b
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Keywords: ., bookcentury1900, bookdecade1900, bookidamericanjour, bookyear1906
