. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . and the wire rheostat. Adjustment for varying the Light. — When the fluorescent screen isused it is essential to be able to vary the amount of hght while theexamination is being made, and this end may be accomphshed byadjustments which enable the operator to vary the speed of the inter-rupter, the amperage, the amount of the condenser, and the length ofthe spark-gap. All coils for use with the fluorescent screen should there-fore have some or all
. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . and the wire rheostat. Adjustment for varying the Light. — When the fluorescent screen isused it is essential to be able to vary the amount of hght while theexamination is being made, and this end may be accomphshed byadjustments which enable the operator to vary the speed of the inter-rupter, the amperage, the amount of the condenser, and the length ofthe spark-gap. All coils for use with the fluorescent screen should there-fore have some or all of these adjustments. A. Pno-e or Riihmkorjf Type of Coil The following cuts will serve to illustrate ways in which a coil ofthis type may be excited. The coil shown in the figures is a Ritchiecoil, and with a current of low voltage (8-10 volts) the usual hammer 1 Electrical Reviezv, July 26, 1899. X-RAY EQUIPMENT 23 break or vibrator is used; with a current of high voltage (110-220volts), some more durable form of interrupter than a vibrator shouldbe employed, — such an one, for instance, as the electrolytic interruptershown on page Fig. 12. Shows primary battery, Ritchie coil with hammer interrupter, and place for one of the two multiple spark-gaps is indicated in this and the following cuts by a card on which are the letters SG.
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