Fig. 64.—Arrangement of the muscle-capstan shown in Life in Motion Fig 63.png. The shadow was projected on the screen. The muscle was placed above the capstan and the nerve was irritated at regular intervals, say of one minute, by tetanising shocks lasting only for a short time, say three seconds. By means of the pulley placed below the stand bearing the capstan, the lifting of the weight (made of cork) with each contraction of the muscle was so large as to be readily seen.