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Scientific American, Vol. 64, No. 11 (March 1891) (1891)

leaf 10

An illustration from Scientific American, Vol. 64, No. 11 (March 1891), 1891, leaf 10
15 15303030 SCSC45454545454560 ec 6060606075T575 Listener. At hand.1> 1415 3 4 5161718 192021910113223 ■a 13132526 27 10 mm, 14 13 14 13 14 13 13 13 14 16 14 12 13 16 15 13 14 14 14 15 14-5 14 13 13 14 14 12 Difference. 0 4 2 4 3 4 3 3 3 4 6 4 2 3 6 5 3 4 4 4 5 4-5 4 3 3 4 4 Tests on Room No.… … distances for a direct and a reflected sound must bemore than 110 feet, for interference. In a forward andback line of transmission, the hall would have to be 55feet long to produce an echo, and if the rate of speak-ing were so deliberate as to permit one-fifth of a secondinterval between…

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