Democratic Sentinel, Volume 18, Number 9, Rensselaer, Jasper County, 16 March 1894 — Sound’s Speed. [ARTICLE]

Sound’s Speed.

In day air at 92 degrees sound travois 1,142 feet per second, of 1 about 775 miles per hour; in water,4, W) feet per second; in iron, 17,5g0 feet par second; in copper, 10,378 feet per 'second-, in wood, 12,000 to 10,000 /eet per sxtond. It has also been proved that the s6un<J of a bell can be heard 45,000 feet through water, and that when the same bell was rung in tho open air it could be heard but 450 feet.—St. Louis Republic.