. Elementary and dental radiography / by Howard Riley Raper . ached to the anode end of the tube.)(5) With the rheostat on a low button, flash the current through the rheostat, flash again, advance rheostat and so on until all theresistance of the rheostat is cut out. (6) If sparking occurs at the parallelspark gap, reduce the vacuum. The most convenient way to do this on amachine not equipped with a vacuum reducing lever, where the vacuumis controlled by a movable arm at the tube (Fig. 44), is to set the arm togive a certain width to tube-regulating spark gap and leave it there.
. Elementary and dental radiography / by Howard Riley Raper . ached to the anode end of the tube.)(5) With the rheostat on a low button, flash the current through the rheostat, flash again, advance rheostat and so on until all theresistance of the rheostat is cut out. (6) If sparking occurs at the parallelspark gap, reduce the vacuum. The most convenient way to do this on amachine not equipped with a vacuum reducing lever, where the vacuumis controlled by a movable arm at the tube (Fig. 44), is to set the arm togive a certain width to tube-regulating spark gap and leave it there. For 92 DENTAL RADIOGRAPHY new tubes the tube-regulating spark gap should be 5 or 6 inches, for oldtubes 2 or 3 inches, this to be governed by sparking at the parallel sparkgap. If sparking occurs at the parallel spark gap the width of the tube-regulating spark gap should be reduced until this ceases. In case the high-frequency coil is operating on a direct current circuit MILUJ flMMETErt RUNNINGPOSITION STRRTINQSWITCH W Z O TUBE TERMINALS w ENO VIEW mr. FRONT VIEW iW 9 Fig. 81. Drawing of a transformer or interrupterless X-ray machine showing various controls. the first step in the technic of manipulating the coil is to set the rotaryconverter in motion. This is accomplished by means of a switch andrheostat. (Fig. 37.) The controls on a transformer built for an are: First (Fig. 81), the main switch;second, the synchronous motor switch, a two-pole,double throw, knife switch labelled starting switch in Fig. 81; third, manipulation or J\. €.transformers. MAKING DENTAL RADIOGRAPHS 93 the on and off switch which controls the output current of the ma-chine; fourth, the pole changer switch; fifth, the rheostat whichcontrols the quantity of output current; sixth, the vacuum reducinglever. The main switch simply brings the current up to the machine. By means of the starting switch the motor is set in motion. Thisrevolves the rectifier switch. The switch is thrown one w
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