High Frequency Apparatus Page 70

70 HIGH FREQUENCY APPARATUS place his connecting wires in a workmanlike manner. High Tension Condensers.-The condenser for connection across the secondary of the induction coil may be made by coating both sides of an 8 x 10 photographic negative with tinfoil in sheets 6 x 8 in. in size. Probably but two or three of these condenser plates will be necessary if they are connected in multiple. For high frequency coils, the condenser will be somewhat larger than for general radio work, but the experimenter will not need to make more than half a dozen of the 8 x 10 plates to insure ample capacity.