| 单词 | pendulum clock | 
| 释义 | pendulum clock He would have benefited from the microscope, telescope, barometer and pendulum clock.  Times, Sunday Times  For example, a pendulum clock moved from sea level to will lose 16 seconds per day.  Retrieved from Wikipedia CC BY-SA 3.0   The old clock may have been removed in the 18th century and replaced by a pendulum clock.  Retrieved from Wikipedia CC BY-SA 3.0   It was used in the first pendulum clocks for about 50 years after the pendulum clock was invented in 1656.  Retrieved from Wikipedia CC BY-SA 3.0   After the war, a pendulum clock was installed and regulated by radio time signals from other timekeeping centres.  Retrieved from Wikipedia CC BY-SA 3.0    | 
	
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