High Frequency Apparatus Page 104

104 Draft HIGH FREQUENCY APPARATUS Pattern for Nos 1 and 2 Casting No.1 copper castings finished size Costing No. 2 finished size Back of casting No 2, showing concentric rings for radiation F "i Finished size of iron casting-No.5-Na6 Similar, but drilled as per Casting No 6 Finished Size Cesting N95 Fig. 2.-Details of electrodes and frame plates both castings are faced off. A piece of in. diameter cold rolled steel rod is cut off 4 in. long and each end faced off and centered in the chuck, bringing its length down to 3% in. Holding the rod in a dog between lathe centers, a light cut is taken for a distance of 1½ in., bringing the diameter eventually down to 1 in. after several cuts have been taken. A slight cut is taken at the end to taper the rod for starting a die on it and the rod is then placed in