| 11. | Each beat gives the balance wheel an impulse, so there are two impulses per cycle.
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| 12. | Many clocks keep time by mechanical resonance in a balance wheel, pendulum, or quartz crystal.
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| 13. | Out-of-balance wheels and poor alignment could eat up much more than 10 percent of your fuel.
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| 14. | The clock movement had a balance wheel regulated to beat at the rate of 2 seconds.
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| 15. | The balancing wheel of PSMT ran on the roads and did not interfere with normal traffic.
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| 16. | The first clocks in northern Europe used foliots, while those in southern Europe used balance wheels.
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| 17. | Synchronous motor clocks are rugged because they do not have a delicate pendulum or balance wheel.
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| 18. | The bimetallic compensated balance wheel was made obsolete in the early 20th century by advances in metallurgy.
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| 19. | Such schemes consisted for example of small bimetallic arms attached to the inside of the balance wheel.
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| 20. | The bimetallic temperature-compensated balance wheel was made obsolete by the discovery of low-thermal-coefficient alloys invar and elinvar.
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