. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 112 C. A. HEILAND There is no reason why alternating current could not be used in resistivity work, the same as it is done in the potential-drop-ratio method. For instance, the current base could be supplied with of moderate frequency by a buzzer, or vacuum-tube oscillator, or by. Fig. 9.—McCollum earth-current meter (after McCollum). Earth-Ctjrrent Meter 5, milliammeter; 6, voltmeter; 9, commutator switch; 10, short-circuiting switch; 11, voltmeter switch; 12, commutator crank; 13, ammeter swi
. Early geophysical papers of the Society of Exploration Geophysicists. Petroleum; Prospecting. 112 C. A. HEILAND There is no reason why alternating current could not be used in resistivity work, the same as it is done in the potential-drop-ratio method. For instance, the current base could be supplied with of moderate frequency by a buzzer, or vacuum-tube oscillator, or by. Fig. 9.—McCollum earth-current meter (after McCollum). Earth-Ctjrrent Meter 5, milliammeter; 6, voltmeter; 9, commutator switch; 10, short-circuiting switch; 11, voltmeter switch; 12, commutator crank; 13, ammeter switch; 14, resistance switch. Earth-Current Meter Contactors 1, trench contactor; 2, cantilever contactor; 3, single terminal electrode with extension rod; 4, single terminal electrode (disassembled). taking, if available, current from the light circuit, and feeding it to the ground through a transformer. The only difficulty would be to obtain an accurate reading of the current; however, the absolute value of the current is not of great importance when using the methods II, 77 a, or // b. To measure the potential difference between the potential electrodes, it would be feasible to have a compensator, and a lead to 442. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Society of Exploration Geophysicists. Tulsa
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