. Radiography, x-ray therapeutics and radium therapy . accompanying illustration shows the tube properlyconnected to the storage battery and the terminals from the coils. It mustalways be home in mind that the entire battery circuit is brought to the full THE COOLIDGE TUBE 37 potential of the tube, and that it, therefore, has to he as thoroughly insulated bothfrom the patient and the ground as has the tube itself. The full circuit is shown in Fig. 35, in which S is the parallel sparkgap, M the milhammeter, B thestorage battery, E the rheostatfor controlling the current inthe filament circuit,
. Radiography, x-ray therapeutics and radium therapy . accompanying illustration shows the tube properlyconnected to the storage battery and the terminals from the coils. It mustalways be home in mind that the entire battery circuit is brought to the full THE COOLIDGE TUBE 37 potential of the tube, and that it, therefore, has to he as thoroughly insulated bothfrom the patient and the ground as has the tube itself. The full circuit is shown in Fig. 35, in which S is the parallel sparkgap, M the milhammeter, B thestorage battery, E the rheostatfor controlling the current inthe filament circuit, and A anammeter for measuring thiscurrent. (A is not shown inthe illustration. It is a con-venience and not a necessity.)As the diagram shows, theresistance is all in, and hencethe filament temperature islowest when the rheostat handleis pushed as far as possible awayfrom the operator. If the polarity of themachine is wrong, it will beshown by the fact that themilliammeter will register nocurrent, regardless of how highthe filament temperaturemay Fig. 34.—Complete Coolidge X-ii,() ;piin-ia ill |jo.^ition. The Battery.~A convenient size is a 5 or 6 cell (10 or 12 volt) 40 am-pere-hour battery, and it will be found much more satisfactory if arrange-ments are made so that the battery can be connected either every night or else whenever not inuse during the day, tothe charging circuit. Insome cases it will befound convenient tohave the battery standon the floor, while inothers it may advan-tageously be placedhigher up on a the latter case it willbe necessary to re-locatethe rheostat on the backof the stand, so that the. handle will point in the right direction. Both the rheostat handle and the cord attached to thepull switch (m the battery circuit) should be brought through the leadscreen which protects the operator, and to a point within easy and con-vement reach.
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