High Frequency Apparatus Page 107

QUENCHED GAP APPARATUS TMD-18 0000000 (11111811110800000 1 REQ THO-160000000000000) 1 REQ FIBRE BRASS nit - STEEL 1REQ TAP-18 1 REQ STEEL -2 REQ. TAD-20 2+ RtQ 4 REQ 4 REQ 4 DEQ TAP 20 107 Fig. 3.-Details of the small parts the central hole was drilled. To do this would require a 10-in. lathe, however, and in view of the admitted restrictions mentioned in the opening paragraphs it was thought best to omit this specification. The facing off and drilling should by all means be done on the faceplate if a sufficiently large lathe is available. Quenched Gap Transformers.-The transformer for use with a quenched gap is essentially the same as that used with the ordinary open gap. The one possible difference worthy of mention is the secondary potential employed. With the quenched gap, this potential may be considerably lower; this change merely introduces an increase in the number of discharges per second. For certain classes of work, this characteristic is of material advantage, while for others it possesses no particular merit. The principal advantages to be derived from the low potential secondary are as follows: The discharge from the high frequency coil is thicker and hotter, although it is