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You will find it Neil..Or we will make you an offer you can't refuse.
FOUND IT :SOURCE: https://www.facebook.com/fromquarkstoquasarsThe first known proposed test was by Isaac Beeckman, who suggested in the early 1600s that a man with a stopwatch could sit atop a hill with a cannon, with a large mirror facing him approximately one mile away. Beeckman believed that when the cannon was fired, the man could start the stopwatch and stop it again after seeing the flash of light off of the mirror. Obviously this method is extremely flawed, and when a similar test was conducted by Galileo it yielded no results. Since then, we have calculated the time delay between the cannon firing and the mirror returning the flash to be approximately 11 microseconds, well below a humanís ability to distinguish a discrepancy in time.