High Frequency Apparatus Page 123

PHYSICIANS' OFFICE EQUIPMENT 123 For the sake of clarity and simplicity, the construction of the various instruments that enter into the assembly of the outfit is divided into eight sections, each part bearing an appropriate heading. The numbers preceding each heading correspond with the numbers assigned to the various instruments shown in Fig. 1 which represents the ground covered in the first part of this chapter. 2. The Magnetic Leakage Transformer. The Rotary Spark Gap. 4. The Stationary Spark Gap. 5. The Oscillation Condenser. 6. The Vacuum Tube Treatment Transformer. 7. The X-Ray Oscillation Transformer. 8. The D'Arsonval Oscillation Transformer. Magnetic Leakage Transformer.-This transformer is of 1 K. W. capacity and the data is given for windings suitable for use on 110 and 220 volt alternating current circuit having periodicities of 25, 60, and 125 cycles. This data will be found in Fig. 2 which gives the details of the transformer. The specific instructions for the building of the instrument apply only to the 60 cycle, 110 volt winding as that is the one most commonly used. The core is a hollow rectangle of laminated silicon steel built up by placing rectangular pieces of the steel with ends overlapping alternately to the right and left as shown in the drawing marked “assembly." Two sizes of core pieces will be needed, namely, 2 x 534 in. and 2 x 634 in. and 340 pieces of each size will be required. The magnetic leakage tongue shown in the center of the core is a bundle of 90 pieces of silicon steel cut 3 in. x 35% in. The silicon steel for the core may be purchased cut to size and ready to assemble, if desired, and this course is the wiser one to pursue if the constructor is not possessed of a gate shear.