Abstract
Measurements have been made on the distribution of pressure and hysteresis effects in a tetrahedral anvil apparatus by simultaneously monitoring the resistances of calibration wires placed at various positions in the pyrophyllite tetrahedrons. A pressure gradient of about 1% is observed, and it is therefore suggested that pressure calibration wires may be placed on the tetrahedron face to determine the pressure throughout the tetrahedron volume. This technique will allow pressure calibration when sample porosity is not known and could possibly permit pressure calibration at elevated temperatures.
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