OCR Text |
Show EFFECT OF WIND ON SOUND Differences In Strength of Wind Is What Prevents the Spread of Sound. Ono of tho government scientists gives on Interesting explanation of tho action of tho wind In preventing tho spread ot sound. It Is, he claims, not tho wind, as such, that prevents sound from trnv-cling trnv-cling ngnlnst It, but differences In tlie strength of tho wind. If, for Instance, tho wind Is stronger nt ono side, Its effect will bo to tilt the sound waves in ono direction or another. Differences Differ-ences of temperature In tho nlr nlso cause deflection of tho. waves of sound. Other atmospheric causes exist which deflect sound from n straight course 'und prevent It from going as far In u certain direction as It may havo been expected to go. S6me of the sirens in this country, says this scientist, produce sound? which ought theoretically to bo Audi-bio Audi-bio at a distance of 1.C00 miles, but, In fact, tho authorities aro satisfied If they nro heard only two miles away. Tho reason for the discrepancy between be-tween calculation nnd experiment wns probably atmospheric deflection of tho sound. |