Abstract
The variations of both longitudinal and torsional velocities in the temperature range 3° to 110° C. have been determined in a few Indian rock specimens. It is observed that the variation is linear and the velocities decrease markedly with increase of temperature. The velocities go back again to the original values as the specimens cool provided the maximum temperature at which the measurements are taken does not exceed 110° C. and the specimens are allowed to cool for a sufficiently long time. The temperature gradient of longitudinal velocities is generally higher than that of the torsional velocities. It is possible that the high frequency method employed in this investigation is such that it is insensitive to small structural changes, if any, that occur in the rock when it is heated at ordinary pressures to 110° C.
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