. Elementary and dental radiography / by Howard Riley Raper . ency coil. * Radiodontia is a new word coined by the writer. Radiodontia is the scienceand art of making and interpreting radiographs of the teeth and contiguous parts. A radiodontist is one engaged in the practice of radiodontia. These words will be found quite useful and have been promptly adopted byall interested in the subject except advocates of Roentgen words, who believe allX-ray words should contain the proper name Roentgen, no difference how un-wieldy or senseless they may be. 85 86 DENTAL RADIOGRAPHY (3) The transformer. W
. Elementary and dental radiography / by Howard Riley Raper . ency coil. * Radiodontia is a new word coined by the writer. Radiodontia is the scienceand art of making and interpreting radiographs of the teeth and contiguous parts. A radiodontist is one engaged in the practice of radiodontia. These words will be found quite useful and have been promptly adopted byall interested in the subject except advocates of Roentgen words, who believe allX-ray words should contain the proper name Roentgen, no difference how un-wieldy or senseless they may be. 85 86 DENTAL RADIOGRAPHY (3) The transformer. We shall consider the manipulation of the induc-tion coil first. Different induction coils have a different number «v» *-«- /r»:i of controls of various sorts. Selecting a coil withtoe induction Coil. , _ b all the different controls 1 shall name them, (bee MAIN SPARK TERMINAL MILLIAMMETER VAGCUM REDUCING LEVERSERIES SPARK GAP -7 AMMETER VARIABLE INDUCTANCESWITCH RHEOSTAT LEVERRESISTANCE ALL IN RESISTANCE ALL OUT-*?; SWITCH LEVERS TOPLATINUM POINTS. Fig. 78. Induction coil, showing the various controls. Fig. 78.) First, the on and off switch; second, the pole changer*;third, the rheostat lever; fourth, interrupter switches, levers andscrews to platinum points; fifth, the parallel or main spark gap; MAKING DENTAL RADIOGRAPHS 87 sixth, the vacuum reducing lever ; seventh, the series spark gap orinverse current spark gap; eighth, the variable inductance switch. The on and off switch is the one by means of which the current isturned into the machine This control is on all coils. The pole changer (Fig. 78) is a double-throw knife switch bymeans of which the secondary current, or output current produced by thecoil, can be made to flow in either direction—when this switch is downon one side the current flows in one direction, when it is down, or the other side it flows in the opposite direction. If, after the tube isconnected to the coil, it is found, by th
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