Show london hears cannonading Canno investigations by the royal meteorological society seem to have established that the cannonade in france tins has been repeatedly heard in london find and even at more distant points good evidence even indicates that one ter bombardi bombardment nent was heard in chiltern hill SOO 2001 tolles blIes distant on the other hand the sound vas nas unheard in certain french zones only 20 miles I 1 behind the lines the explanation of the scle scientists ts Is that the sound waves travel over these silence zones but at greater distances are reflected buck back toward the earth by the hydrogen in the atmosphere CO 50 miles above the earths surface |