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Grandfather-Clock

Before pendulum clocks were invented, Peter Henlein of Germany invented a spring-powered clock around 1510. It was not very precise. The first clock with a minute hand was invented by Jost Burgi in 1577. It also had problems. The first practical clock was driven by a pendulum. It was developed by Christian Huygens around 1656. By 1600, the pendulum clock also had a minute hand. The pendulum swings left and right, and as it swings, it turns a wheel with teeth (see the picture to the right). The turning wheel turns the hour and minute hands on the clock. On the first pendulum clocks, the pendulum used to swing a lot (about 50 degrees). As pendulum clocks were improved, the pendulum swung a lot less (about 10 to 15 degrees). One problem with pendulum clocks is that they stopped running after a while and had to be restarted. The first pendulum clock with external batteries was developed around 1840. By 1906, the batteries were inside the clock.
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Process bell
ID: HP-022335
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ID: HP-015314
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ID: HP-015315
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ID: HP-015317
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ID: HP-015320
grandfather clock
ID: HP-015323
grandfather clock
ID: HP-015329
Linden wood grandfather clock
ID: HP-015332
grandfather clock
ID: HP-015334
grandfather clock
ID: HP-015337
Daechu grandfather clock
ID: HP-015339
grandfather clock
ID: HP-015342
Linden wood grandfather clock
ID: HP-015346
Linden wood grandfather clock
ID: HP-015348
grandfather clock
ID: HP-015351
grandfather clock
ID: HP-015353
Linden wood grandfather clock
ID: HP-015356
grandfather clock
ID: HP-015259
grandfather clock
ID: HP-015261
grandfather clock
ID: HP-015262

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