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Show LIGHTNING AND THUNDER. By counting the number of seconds In the interval between lightning and thunder it is possible to figure out approximately how far from the observer ob-server is the scene of the storm. Sound travels 1,100 feet a second, so multiply the number of seconds by 1,100. which will give the distance in feet from the point where the lightning light-ning flashed. For example, if ten seconds sec-onds have elapsed the distance away will be 11,000 feet, or a little over two miles. It might be added that, as light and lightning travel so much faster than sound, if one survives after hearing the crashing peal he can be sure he 1! safe Rpmpmbrnnr'o r,f tliiQ dissipate terror. Thunder can be heard a relatively short distance only. Strong cannonading can be heard as far off as seventy or seventy-five miles, while thunder is usually not farther away than twelve or fifteen miles. In only exceptional instances does the interval between thunder and lightning amount to 100 seconds, so that the extreme distance at which thunder can be heard may be put down as about twenty-one miles. |