. Radiography and radio-therapeutics . he present design) of what it iswithout the hood. The advantage of this arrangement has been demon-strated by a number of experiments carried out by Coohdge. Control for Coolidge Tubes.—The current required to operate a heatingelement in a Coohdge tube is obtained either from an accumulator or froma transformer. The disadvantage of the accumulator system is that thecells require recharging at intervals, and the out-put from the accumulator varies at different timesaccording to whether it is fully charged or nearlyrun down. The better system is to emjsloy
. Radiography and radio-therapeutics . he present design) of what it iswithout the hood. The advantage of this arrangement has been demon-strated by a number of experiments carried out by Coohdge. Control for Coolidge Tubes.—The current required to operate a heatingelement in a Coohdge tube is obtained either from an accumulator or froma transformer. The disadvantage of the accumulator system is that thecells require recharging at intervals, and the out-put from the accumulator varies at different timesaccording to whether it is fully charged or nearlyrun down. The better system is to emjsloy a step-down transformer, which is operated from an alter-nating current supply, and istherefore particularly useful whenworking the high-tension trans-former from a main alternatingcurrent. In those cases in whichthe transformer is worked fromcontinuous current supply or aninduction coil is employed, it isnecessary to use a small rotaryconverter. One of the great advantagesof the transformer system ofcontrol is that a constant move-.
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