1/5th second is simply the rate at which the balance wheel on a standard stopwatch ticks... 18000BPM.
-Chuck Harris 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 https://books.google.com/books?id=PlQkH-OxxucC&lpg=PT489&ots=l0HxdHUOJp&dq=horse%20race%20timing%20stopwatch%20history&pg=PT489#v=onepage&q=horse%20race%20timing%20stopwatch%20history&f=false "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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