[time-nuts] Visual clock comparison
cfharris at erols.com
Sun Apr 19 23:25:10 EDT 2015
1/5th second is simply the rate at which the balance
wheel on a standard stopwatch ticks... 18000BPM.
Jim Lux wrote:
> Hence the reason that horse races are traditionally timed in 1/5th second
> increments. (1/5th second is also about 1 stride for a race horse at full gallop
> 3.5-4 m/stride... 17 m/s)
> a bit of googling turns up
> "Stopwatches timing to 1/5 second were being used to time races befor 1731, by which
> time they were in commercial production, seven years befor ethe earliest use of
> 'stop-watch' known to the OED"
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