Interstate medical journal . Fig. 18. The scamnum in dislocation in-wards of the thigh. Counterextension main-tained by the horizontal Fia. 19A. Anterior and posterior views of the machineof Fabrus. (After Vidius.) Between them is an ambewhich has at its axillary end a bolt to fit into the top cross-bar of the machine. The power varies only with the ratio of the diameter ofthe axle to length of crank. The pulleys do not multiplypower.

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