arnfield's gravity escapement used in the BHI 150 clock realised in lego A two pendulum version of the escapement used in the three pendulum clock built to mark the 150th anniversary of the British Horological Institute. The escapement, designed by James Arnfield, is, as with his single pendulum escapement, completely detached from the train torque, so should be capable of excellent consistency of rate. For videos of the actual clock see 'luddite22''s page. The escapement works as follows. On the central vertical shaft, driven by the going train, are two arms. The lower is the locking arm, the upper is the gravity arm. As the vertical shaft rotates, the tail end of the gravity arm (unfortunately I had to use wire for this critical part), catches on the appropriate prop arm (the props are hanging from the top left and right of the frame and are arranged to hang directly in the path of the gravity arm tail), which then pushes down the tail of the gravity arm, lifting the head. Now that the gravity arm is no longer in contact with the locking arm, the latter is tail heavy and hits the locking detent after a rotation of 180 degrees. The escapement is now reset. A pendulum now unlocks the the gravity arm by lifting the head, which lowers the tail and causes the prop arm to revert to its natural position. The gravity arm is now only held by the pendulum, and as it falls below its rest position, gives impulse to the pendulum. As it gives impulse, the arm accelerates downwards, and is suddenly arrested by contact with the head of the locking arm ...
Richard of Wallingford clock. Foliot escapement. I Richard of Wallingford (1292-1336) was a son of a blacksmith. He studied at Oxford University and he became a benedictine monk of Sant Albans Abbey. He used his experience as a blacksmith and his scientific knowledge gained in Oxford to write the oldest existing treatise on the construccion of a mechanical astronomical clock. This is a reconstruction placed in the Whipple Museum of Cambridge. This video shows the special scapement of verga and foliot. It is diferent from other foliot scapements because it has not a wheel with curved teeths but a double wheel with pins. Really amazing!
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Cassiobury Park Turret clock Made by Leonard Tennant, c. 1610 in London. British Museum. Interesting clockwork with vergue and foliot scapement in working order. It´s marked with the scallop shell that L. Tennant used to sign his clocks. The movie is too long but at the end the clockwork strikes at four o´clock. Reloj de torre, turret clock, orologio da torre, Turmuhr, Horloge d´Edifice, foliot