. Radiography, X-ray therapeutics and radium therapy . f themachine is wrong, it will beshown by the fact that themilliammeter will register nocurrent, regardless of how highthe filament temperaturemay be. 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-tageou
. Radiography, X-ray therapeutics and radium therapy . f themachine is wrong, it will beshown by the fact that themilliammeter will register nocurrent, regardless of how highthe filament temperaturemay be. 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 1hehandle will point in I beright direction. Both the rheostat handle and the cord at Inched to thepull switch (in the battery circuit) should be brought through the leadscreen which protects the operator, and to a point within easy and con-venient reach. Fig. 34.—Complete Coolidge X-ray equipment in position.(). Pig. 35.— Diagram of connections for Coolidge babe. 38 RADIOGRAPHY Method of Operating.—The technique of various operators and thesources of excitation vary so much that it is difficult to make very detailedsuggestions. The following general considerations, however, may be ofvalue. The higher the filament temperature, the greater the discharge current. The higher the voltage backed up by the tube, the higher thepenetration. A simple method for starting radiographic work with the tube is asfollows : Take a case, for example, where the operator has been setting hisrheostat on the 10th button, and adjusting his tube to where it then draws30 millianiperes. In this case, all that is necessary, with the Coolidge tube,is to set the rheostat on the 10th button, light up the filament in the tube,having the handle pushed as far away as possible, close the main switch, andpull on the rheostat handle until the tube is drawing 30 millianip
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