Collected Experimental Papers: Volume I: Papers 1-11 by P. W. Bridgman

By P. W. Bridgman

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Possible short-circuiting from one electrode to the other through the liquid has already been excluded by the measurements of the insulation resistance of the plug with a dummy capillary. In addition, the resistance of the electrodes between the mercury and the plug may change because of (1) lengthening of the free part of the electrode by depression of the mercury surface under pressure or distortions in the containing vessel, (2) pressure effects on the specific resistance of the platinum, (3) and change in resistance at the soldered connection between the electrodes and the plug.

8 mm. in diameter were large enough. The third effect was found to be troublesome by Lisell, who avoided it by using long metal wires of resistance high in comparison with the resistance of the joint. No trace of this effect could be found, however, in this investigation. The absence of all three effects was tested by measuring the resistance when the terminals were short-circuited by dipping into a large tube of mercury, the resistance of the mercury now being negligible. In this case, the depression of the mercury due to compression is much greater than in the U capillary actually used.

The readings of Gauge Π are consistently higher than those of Gauge I, a discrepancy which would point to a slight error in determining the effective area of the pistons. The discrepancies also show a tendency to become larger at the higher pressures. This is probably no fault of the gauges themselves, but may be due to the increased difficulty of making fine adjustments of pressure at the higher values. The method of procedure was to apply a known 216 PROCEEDINGS OF T H E AMERICAN ACADEMY. weight to the piston, and then vary the pressure until equilibrium was produced.

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