. Elementary and dental radiography / by Howard Riley Raper . 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 APPEN
. Elementary and dental radiography / by Howard Riley Raper . 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.). Figure 360. -X-ray and electrotherapeutic machine. High-frequency type,wide, IS inches deep, 4S inches high. Size: 24 inches Figure 363 illustrates what is called a dentalDental X-Ray Unit. X-ray unit. There are several points of interestregarding its construction. Let me describe the oneillustrated. Electrically it is an induction coil with an electrolytic first units were all induction coils. (Recently units of theTesla or high-frequency type have been placed on the market.) Beingsmall it is easily movable and so, with the tube fastened to the adjustableupper part, it acts as a tube stand. The X-ray tube used with this unit is a special one. First, a valvetube to cut out inverse is built into it as is indicated by the illustration(Fig. 363) which shows two, instead of the usual one, bulbular , for protection the bulbular part of the X-ray tube proper is madeof lead glass save for a window of ordinary glass through which theX-rays are directed on the part t
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