High Frequency Apparatus Page 194

194 HIGH FREQUENCY APPARATUS withdrawing the cord. Short lengths of No. 8 stranded conductor are soldered to the primary taps to establish connection with a regulating switch. The primary may then be placed on the remaining leg of the core and the end pieces. interleaved to complete the magnetic circuit. The entire transformer may then be mounted in a suitable case of wood as shown in Fig. 8. Wooden blocks placed above and below the core serve to hold the transformer securely in position and the case is supplied with handles as shown in the drawing to facilitate carrying. The primary and secondary terminals should be mounted inside the cover in order that the working parts of the instrument may be entirely enclosed and thus protected from injury in shipment. If the case is substantially made it will serve as a shipping crate of convenient and effective design. The secondary wires are brought to suitable terminals mounted on pillars of fibre inside the box while the primary terminals are brought to the contacts of a regulating switch likewise mounted on the wall of the case. The winding Fig. 8.-Case or container for the transformer