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Application of the Screw

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-110

2025-12-22

1006

Lifting jacks, cotton and hay presses, the screw propeller of ships, and air fans are familiar examples of the practical uses to which the screw is put, besides the constant use that is made of it in machinery and woodworking. The spherometer and micrometer screw are examples of its use in scientific work. The speed counter shown in Fig. 1 shows how an endless screw, meshing into teeth on the circumference of a wheel, can be used to determine the rotation of an axle, the pointed end of the screw being thrust into a hole in the end of the axle and rotating with it.

Fig. 1