. The American journal of roentgenology, radium therapy and nuclear medicine . tro-static voltmeter in the background gave thehigh tension line voltage. In each case, with no metal connection tothe floor or pipe, there was no appreciablecurrent to the plate even on direct contact,, when spark gap No. 2 was closed. Figure 6 shows the photographs of sparkgap No. 2 with the data of tube operation atthe time the discharge occurred. A scale Editorial 617 in inches placed just back of the gap wasphotographed at the same time and indicatesthe jumping distance from one terminal ofthe tube to the c
. The American journal of roentgenology, radium therapy and nuclear medicine . tro-static voltmeter in the background gave thehigh tension line voltage. In each case, with no metal connection tothe floor or pipe, there was no appreciablecurrent to the plate even on direct contact,, when spark gap No. 2 was closed. Figure 6 shows the photographs of sparkgap No. 2 with the data of tube operation atthe time the discharge occurred. A scale Editorial 617 in inches placed just back of the gap wasphotographed at the same time and indicatesthe jumping distance from one terminal ofthe tube to the conductor under normal con-ditions of operation. It should be remembered, however, thatany irregularity of operation or especiallythe opening or failure of the filament circuit, either a partially grounded or a fullygrounded conducting support. The Table gives a few of the readingsand conditions of operation. When trying the same tests, using a trans-former without a grounded middle on a set-ting of 5 ma. and a 9 inch gap, the passageof a spark through 2 caused a break of 14. No. I. No. 2. No. 3- No. 4- ■^ . 3S M^ No. 5. Xo. 6. No. 7. No. 8. Fig. 6. Photographs of discharge across gap No. 2 under various conditions. Observe the insignificantspark discharge when plate is insulated. The most serious arc was on a setting for 5 ma., an 8 inchspark gap with an auto-transformer I. 5 ma.; 5 inch gap; resistance control; no ground. A series of sparks; current too small to measure. 8 inch gap; resistance control; insulated. A series of sparks; current about 12 ma. 8 inch gap; resistance control; grounded; current about 25 ma. 8 inch gap; auto-transformer control; partial ground. 8 inch gap; auto-transformer control; current more than 200 ma. ; 5 inch gap; grounded; resistance control. ; 5 inch gap; grounded; auto-transformer 8. 35 ma.; 5 inch gap; insulated; resistance control. No. 2. 5 ma.; No. 3- 5 ma.; No. 4- 5 ma.; No. 5- 5 ma.; No. 6. 35 ma. No. 7- 35 ma. o
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