. Dental radiology . ds in general use for the generatingof the high potential current; we will consider them in theorder of their efficiency. First, the motor-generator-transformer type, commonlyknown as the interrupterless, with a maximum output of110,000 volts, and as high as 200 milliamperes. Secondly, the induction coil, with a maximum output ofabout 120,000 volts in a 12-inch coil, but with a milliamperageof from 15 to 30. Thirdly, the static machine, with a maximum output ofabout 200,000 volts in one of the largest machines, and about2^2 to 5 milliamperes. Lastly, the Tesla transformer,
. Dental radiology . ds in general use for the generatingof the high potential current; we will consider them in theorder of their efficiency. First, the motor-generator-transformer type, commonlyknown as the interrupterless, with a maximum output of110,000 volts, and as high as 200 milliamperes. Secondly, the induction coil, with a maximum output ofabout 120,000 volts in a 12-inch coil, but with a milliamperageof from 15 to 30. Thirdly, the static machine, with a maximum output ofabout 200,000 volts in one of the largest machines, and about2^2 to 5 milliamperes. Lastly, the Tesla transformer, with an average maximumoutput of about 60,000 volts, and only 1 or 2 milliamperes. We will consider the types that we have mentioned, takingup first the most efficient, the interrupterless type. This isan apparatus that represents the very latest achievement of themanufacturers. It is a type of apparatus that enables us to doinstantaneous work in radiography. We will describe the con-struction of it very briefly. 59. Figure 8—(see page 62)60 If the direct current is the source of supply, then a rotaryconverter is used to produce an alternating current from thedirect current. The motor set consists of a rotary converter onthe direct lighting circuit, either 220 or 110 volts. The rotaryconverter changes the direct current into an alternating andpasses it through the necessary switch, on the switchboard, andthe rheostat to the transformer. On the end of the shaft of themotor is attached a round micanite disk. The low potentialalternating current collected from the converter side is passedthrough the primary of the transformer which increases itspotential to about 100,000 volts at a primary current of from25 to 50 amperes, depending on voltage used. The high poten-tial alternating current is then conducted from the transformerto a rotary polechanger, mounted on the armature shaft ofthe converter. The rotary polechanger consists of a round micanite disk.*To the periphery of this
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