Show ECHOES LOUDER THAN SOUND probably hard thing to imagine su but t science has proved it a fact beyond doubt to most persons persona it would seem impossible for or an echo to be louder than the sound bound that produced the echo but under certain rather peculiar condition conditions this Is really true when a revolver Is fired from a balloon the report Is sharp but not so loud as ar tt it would be it if the gun were A red fired on the surface of the oarth earth if the balloon to is up something like 2000 feet or higher there will be a few seconds silence after the revolver shot hot and then a roar or deep rumble will rise up from the earth it an explosive la is lowered from the basket of the balloon until it hanga a few hundred feet beet below and it Is discharged with ara an electric spark from a battery in the hands bands of one of the aeronauts aero there will come to the ears of those above a report like a revolver shot and then a few seconds of 0 silence followed by a peal of the loudest thunder ever heard there Is no solid background about or bove the balloonists to produce a rebound of the atmospheric sound wave and the air Is more dense below thus when the sound loudd waves penetrate the denser lower strata of air a and d then the solid earth the echo produced deuced seems to the ears of the occupants of the balloon far louder than the original sound harpers weekly |