. Elementary and dental radiography / by Howard Riley Raper . the gap increases amperage at the expense ofthe voltage. The wattage remains the same. For X-ray work the gapshould be as short as possible, without reducing the voltage to a pointwhere the current will not pass through the X-ray tube. High-frequency or Tesla coils are often spoken of as suitcase coils and portable coils, because they are frequently built in the shape of asuitcase and are transportable. Some coils of this type are mere toys, incapable of doing good dentalwork, while others compare favorably, on the circuit, wit
. Elementary and dental radiography / by Howard Riley Raper . the gap increases amperage at the expense ofthe voltage. The wattage remains the same. For X-ray work the gapshould be as short as possible, without reducing the voltage to a pointwhere the current will not pass through the X-ray tube. High-frequency or Tesla coils are often spoken of as suitcase coils and portable coils, because they are frequently built in the shape of asuitcase and are transportable. Some coils of this type are mere toys, incapable of doing good dentalwork, while others compare favorably, on the circuit, with small andmedium size induction coils. One should be cautious, therefore, whenpurchasing a coil of this type. 36 ELEMENTARY RADIOGRAPHY As stated, the primary, or supply, current of a coil, built on the high-frequency plan illustrated, should be When attaching the portablecoil (Fig. 14) on an circuit, therefore, all that needs to be done isto screw the attachment into a lamp socket. Terminal Spark Gap(//of rejalatinj spark $ap) ZnJ Coil Condenser. iiCoil orStep - UpTransformer Fig. 35. RotaryConverter. When the supply current is , a rotary con-verter should be used. A rotary converter (Fig. 36)consists of an electric motor set in motion by thesupply current, which motor in turn revolves thearmature of an dynamo, which generates the electricity that is sentinto the coil. Instead of having the motor and the generatoras separate machines connected by a common shaft so that movement ofthe armature of one machine revolves the armature of the other, therotary converter can be made so as to be enclosed in one casing. (Fig. 15.)Tracing the current, as per Fig. 37, coming through the fuse andswitch, the current passes through the positive wire to the starting box X-RAY MACHINES 37 or rheostat. It leaves the starting box through two wires, passingthrough one to the field of the motor marked , through the other tothe armature of the motor, marked ARM, and
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