Description | Detail drawings of the drum and weight for the whirling arm, a machine for conducting experiments in aerodynamics and drag ['resistance of the air']. With a mount apparatus, possibly for rifle experiments.
The whirling arm's drum was spun rapidly by a falling weight which in turn revolved an arm (of 4 feet in length) attached to the conical head of the device. Bodies for testing were attached to this and achieved speeds of several feet per second for brief periods.
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