. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . oreign Bodies. First Exposure. rent through the primary. These coils again require specialtubes, having heavy anti-cathodes of platinum or provided witha water cooling device to prevent the melting and destructionof the anti-cathode. The tube at the time of the exposureshould be of low vacuum, otherwise the impression of the ob-jects sought would not appear on the sensitized plate, the rayshaving traversed its substance. Another matter of importance is the necessity of the ab-solute fixed position
. A manual of electro-static modes of application, therapeutics, radiography, and radiotherapy . oreign Bodies. First Exposure. rent through the primary. These coils again require specialtubes, having heavy anti-cathodes of platinum or provided witha water cooling device to prevent the melting and destructionof the anti-cathode. The tube at the time of the exposureshould be of low vacuum, otherwise the impression of the ob-jects sought would not appear on the sensitized plate, the rayshaving traversed its substance. Another matter of importance is the necessity of the ab-solute fixed position of the object during exposure. The pa- 212 STATIC ELECTRICITY. tient will of necessity be compelled to abstain from breathingduring the intervals of radiation. This is best managed bystrapping him to the table after the sensitized plate has beenplaced in position and then instructing him to breathe at inter-vals, as signaled, always taking the same depth of inspiration,and exhaling it softly. At the instant of the patients takingan inspiration, the current is to be cut off. By this plan, the. Fig. 27—Locating Foreign Bodies. Second Exposure. movements of the diaphragm will not interfere with the rela-tive position of the calculus. \\ ith the apparatus abovedescribed, the exposures need not exceed three to five development of the negative in these cases requires adegree of skill and familiarity with the work which will deter-mine the success or failure of the diagnosis. It should be thehabit of the radiographer to have some landmark, as a rib, thebody of a vertebra, or the crest of the ileum to guide
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