. 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 . 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 Fig. 13. Shows storage battery, Ritchie coil with hammer interrupter, and tube. 24 THE ROENTGEN RAYS IN MEDICINE AND SURGERY

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