Word: clap
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Dates: during 1890-1899
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...Clap, John Corbin...
...interesting observation was made by assistants of the observatory during the electrical storm of last week. The assistants, who were at their homes in different parts of Cambridge, all heard the clap of thunder only two or three seconds after they saw the flash. As the difference in the rates at which sound and light travel is only five seconds a mile, it is proved that in such electrical storms the rate of sound is much accelerated...