MEASURING THE DISTANCE OF THUNDERSTORMS.
As a matter of fact, thunder and lightning- occur simultaneously; the interval observed between the phenomena being due to the fact that sound only travels at the rate of 1100 ft per second, while the passage of light is almost instantaneous. But it is an easy matter to tell at least approximately, how many miles a thunder storm is away. A normal pulse will beat about one stroke to the second, and by counting the pulsebeats during the interval of the lightning and the thunder, the lapseof seconds is arrived at and consequently the number of feet, which can be reduced to miles. For example: If thirty seconds elapse between the flash of lightning and the crash of thunder, the storm centre is at a distance of 33,000 ft, or about six and a quarter miles.
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Southern Cross, Volume 2, Issue 3, 21 April 1894, Page 3
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141MEASURING THE DISTANCE OF THUNDERSTORMS. Southern Cross, Volume 2, Issue 3, 21 April 1894, Page 3
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