. The American journal of roentgenology, radium therapy and nuclear medicine . y wooden table and a sparkgap and a milliammeter connected in seriesto one terminal of the tube. The plate or thewater may then be regarded as related to thecircuit in the same manner as the patientsbody. When no connection is made from theconductor to the earth we have the case ofa well-insulated patient. When a wire passesfrom the conductor to the floor we have a 6i6 Editorial partial ground. When the wire is connectedto a water pipe we have a complete ground. Figure i shows the arrangement of ap-paratus and Figur
. The American journal of roentgenology, radium therapy and nuclear medicine . y wooden table and a sparkgap and a milliammeter connected in seriesto one terminal of the tube. The plate or thewater may then be regarded as related to thecircuit in the same manner as the patientsbody. When no connection is made from theconductor to the earth we have the case ofa well-insulated patient. When a wire passesfrom the conductor to the floor we have a 6i6 Editorial partial ground. When the wire is connectedto a water pipe we have a complete ground. Figure i shows the arrangement of ap-paratus and Figures 2 to 5 are photographsof the set-up, showing some of the meterreadings and the nature of the discharge. The tube was excited by a transformer ofstandard make with the usual connection be- (1) When the plate P is insulated. (2) When a poor or partial ground ismade by a wire to the floor. (In this casethe wooden floor was laid on concrete.) (3) When grounded by a piece of wireto a water pipe. Not only were readings taken of the gapsand the currents passing, but flash light. Fig. 2. 5 ma.; 8 inch spark gap; well insulated. Slightleakage across gap No. 2; too weak to photograph;not enough to deflect the milliampere needle. Fig. 3. 3 ma.; 8 inch gap; resistance control; partialground; spark discharge. tween the middle of the secondary and thecase, but the case was not grounded by a con-ductor, it simply stood on a dry wooden plat-form. Under these circumstances therewould be less current than when the case iswell grounded. Spark gap No. 2 and milli-ammeter No. 2 serve to show how close aconductor must be brought to the line to geta discharge and the milliammeter showswhat current flows when a discharge conditions are considered: Fig. 4. 4 ma.; 5 inch gap; resistance control; partial 5. 5 ma.; 3 inch gap; auto-transformer control; complete ground; gap current exceeding 200 ma. photographs were used to get instantaneousreadings of the meters. A large electr
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1900, bookyear1906
