. Elementary and dental radiography / by Howard Riley Raper . Figure 358.—Special dental X-ray machine. Induction coil type. Size: 30 inches wide, 1 inches deep, 44 inches high. terminal to which the vacuum reducing lever is attached. Back of theseterminals are two others. It is interesting to know what these two extraterminals are for. They are connected directly to the terminals of the secondary winding X-RAY MACHINES 3^5. Figure 359.—Special dental X-ray machine. High-frequency coil type. Size: 24 inches wide, 1G inches deep, 52 inches high. of the transformer before rectification, so that
. Elementary and dental radiography / by Howard Riley Raper . Figure 358.—Special dental X-ray machine. Induction coil type. Size: 30 inches wide, 1 inches deep, 44 inches high. terminal to which the vacuum reducing lever is attached. Back of theseterminals are two others. It is interesting to know what these two extraterminals are for. They are connected directly to the terminals of the secondary winding X-RAY MACHINES 3^5. Figure 359.—Special dental X-ray machine. High-frequency coil type. Size: 24 inches wide, 1G inches deep, 52 inches high. of the transformer before rectification, so that the current delivered atthese two terminals is high potential alternating. In addition to the safety valve action, they have two other is to indicate when the disc switch is out of synchronism. Whilethe current slopping across these two terminals occasionally, would notindicate anything wrong with the switch, if the current slops across reg- 326 APPENDIX ularly and in considerable quantity, it is a certain indication that the dischas gotten out of synchronism. The remaining function is to deliver unrectified alternating currentto a high-frequency attachment, should the user of the transformer desireto operate a high-frequency apparatus in connection with the transformer.(Fig. 356.)
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