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    				| 1. | 
                                    What is the length of pendulum | 
                            
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Answer»  tion:The most COMMON pendulum LENGTH in quality clocks, which is always used in GRANDFATHER clocks, is the seconds pendulum, about 1 metre (39 inches) long. In mantel clocks, half-second pendulums, 25 cm (9.8 in) long, or shorter, are used.  | 
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