stantly re- thread on its slightly convex bottom. It is ceives an accelerated motion, which is most obvious that, when hurled as it is with light- rapid when theshuttleis midway in its course, ning rapidity, the friction onthe thread must and gradually in the same manner decreases be excessive.… … dially in the slot. Consequently when near- ted. A certain speed of the mechanism be- estthe center it imparts an extremely slow ing just sufficient tomake the throw, an in- or no motion to the shaft, B, and a quick crease in velocity may result in causing movement when it has traveled out toward…
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