. Radiography and radio-therapeutics . Fig. -Coinplete Coolidge X-ray equipment inposition. (). Fig. 49.—Diagram of connections for Coolidge , Spark-gap. R, Rheostat for controlling current M, Millianimeter. in the filament circuit. B, Storage battery. A, Ammeter for measuring current in filament circuit. 64 RADIOGRAPHY connected to the storage battery and the terminals from the coil. It mustalways he home in mind that the entire hattery circuit is hrought to the fullpotential of the tube, and that it, therefore, has to be as thoroughly insulated bothfrom the patient and the g
. Radiography and radio-therapeutics . Fig. -Coinplete Coolidge X-ray equipment inposition. (). Fig. 49.—Diagram of connections for Coolidge , Spark-gap. R, Rheostat for controlling current M, Millianimeter. in the filament circuit. B, Storage battery. A, Ammeter for measuring current in filament circuit. 64 RADIOGRAPHY connected to the storage battery and the terminals from the coil. It mustalways he home in mind that the entire hattery circuit is hrought to the fullpotential of the tube, and that it, therefore, has to be as thoroughly insulated bothfrom the patient and the ground as has the tube itself. The full circuit is shown in Fig. 49, but the ammeter is notshown in illustration 48. As the diagram shows, the resistance is all in,and hence the filament temperature is lowest when the rheostat handle ispushed as far as possible away from the operator. If the polarity of the machine is wrong, it will be shown by the factthat the milliammeter will register no current, regardless of how high thefilament temperature may be. The Battery.—A convenient size is a 5 or 6 ce
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