This animation demonstrates Movement No. 72 from Henry T. Brown’s 507 Mechanical Movements — a classic tilt-hammer mechanism. A rotating cam (or wiper-wheel) B engages the tail of hammer A, lifting and releasing it repeatedly. With four lobes on the cam, the hammer strikes four times per full revolution, converting continuous rotary motion into repeated percussive impacts. This type of mechanism was widely used in forges, mills, and early industrial machinery.
72. Is a tilt-hammer motion, the revolution of the cam or wiper-wheel, B, lifting the hammer, A, four times in each revolution.