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Cricket..... Rpm

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paulllambert | 03:58 Fri 18th Jul 2014 | Sport
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I've been meaning to ask for ages. When a spin bowler has sent his delivery down, the RPM (revolutions per minute) is shown on the screen within a couple of seconds. It seems to vary from 1800ish to over 3000. What kind of device is used to measure the RPM so accurately and quickly?
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Couldn't be certain, but probably Hawkeye.

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