| Show roc florns in a communication to the french academy ot of sciences an all explanation is given give of borneo bomert f I 1 lie hitherto unaccountable phenomena pertaining to gor horns borns it has licen been found in regard to acoustic signals or sirens that they aro are surrounded by a neutral zone iu in which the iho bound is not heard at tile tho sea level a zone more or less dutant according to the height of if the siren biren on oil tho the coast and it has a meau width of about feet fee I 1 ou on tho the nearer dearer side of this zoua zone tho the sound is of course heard beard perfectly but when it is traversed the sound bound weakens gradually until it becomes fc fic arcely perceptible cep tible when it increases again und and on oil tile tho zone being left behind tile tho sound bound resumes its full intensity experiments have been made on oll this abis lino line with a essel by causing it to approach or from a lightship in different forent dif direct ions and in ili a ft raight bt liue line in each course according to tho lie account pub bibbed the bound was v aa deadened almost almos t completely in a zone whose central ED una was about IS feet from tho the siren biren |
