Absence of gravity-wave signals in a bar at 1695 Hz

A 118-kg bar shows vector amplitude changes ("impulses") in successive 24-msec intervals which correspond to bar energies E distributed with a probability N=N0exp(-EkTe), with Te30 K. Not more than one impulse larger than 537 K was observed in 9 days. Calibration impulses giving the bar 600 K of energy were detected with 60% efficiency above a 537-K threshold. In the following Letter, these results are contrasted with the gravity-wave detections of Weber. © 1973 The American Physical Society.