. Elementary and dental radiography / by Howard Riley Raper . e there is much line drop. In many cases, however, there are twoseparate sources of alternating current supply and then the filament trans-former is to be recommended for everything. In Fig. 367 the tube is shown properly con-Cennectionf. nected to the storage battery and the X-ray machine. It must always be borne in mind that the entire bat-tery circuit is brought to the full potential of the tube when the tube isenergized for use and that the wires from the battery should therefore be 334 APPENDIX as thoroughly insulated from the
. Elementary and dental radiography / by Howard Riley Raper . e there is much line drop. In many cases, however, there are twoseparate sources of alternating current supply and then the filament trans-former is to be recommended for everything. In Fig. 367 the tube is shown properly con-Cennectionf. nected to the storage battery and the X-ray machine. It must always be borne in mind that the entire bat-tery circuit is brought to the full potential of the tube when the tube isenergized for use and that the wires from the battery should therefore be 334 APPENDIX as thoroughly insulated from the patient and the ground as the tube itself. The full circuit is shown in the schematic diagram, Fig. 367, inwhich S is the parallel spark gap, M the milliammeter, B the storagebattery, or small transformer, R the rheostat for controlling the currentin the filament circuit, and A an ammeter for measuring this current. Thebest technic for the Coolidge tube demands the use of an ammeter inthe filament circuit. The meter should have a 5-ampere scale large enough. Figure 367.—Diagram of Coolidge tube connections. to be easily and accurately read. The meter should be located as close tothe operator as possible and in such a way that it can be easily read fromthe operating position. _ . „ ,. , The technic of various operators and the tectonic Tor Using c .. ,. , .. . r , ■. A., Coolidge tube sources of excitation of the tube vary so much that it is difficult to make detailed suggestions which are universally applicable. The following general considerations, however, may be of value: Bear these two things in mind: First, the higher the filament current—i. e., the hotter the filament—the greater the milliamperage which can be sent through the tube. Second, the higher the voltage backed up by the tube—i. e., the longer the parallel spark backup—the greater the penetration of the X-rays produced. X-RAY TUBES AND THE X-RAYS 335 A simple method of starting radiographic work wit
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