Elements of natural philosophy (Volume 2-3) . ELEMENTS OF ACOUSTICS. 67 If a! and a continue equal, and we make A—A=l%0°, supposition;then will Equation (26), give a - = o; x ,c\r Consequence; [2b).. or in words, one of the equal silence sounds will destroy the other. Fig27 produced; Thus it appears that two equal sounds reaching the same point may be in such relative condition that one will wholly neutralize the other, and the two produce perfect silence. This phenomenon is called the Inter-Interferencc of ,. „ •, sound. jerence ot sound. With any other values for A and A than those whichgive
Elements of natural philosophy (Volume 2-3) . ELEMENTS OF ACOUSTICS. 67 If a! and a continue equal, and we make A—A=l%0°, supposition;then will Equation (26), give a - = o; x ,c\r Consequence; [2b).. or in words, one of the equal silence sounds will destroy the other. Fig27 produced; Thus it appears that two equal sounds reaching the same point may be in such relative condition that one will wholly neutralize the other, and the two produce perfect silence. This phenomenon is called the Inter-Interferencc of ,. „ •, sound. jerence ot sound. With any other values for A and A than those whichgive Af - A = 180°, Equation (26), shows that a . 2a - <—; X X Result of partialcoincidence oftwo sound waves. that is, that the sound in the resultant wave will be lessthan double that in either of the equal component waves. 60. To ascertain the precise relation between twoCoudItions tI,at i • i •ii i it W*N cailse two equal waves, which will cause one to destroy the other, equai waves to neutralize eachother. make, in Equation (20), A = A! ± 180° = A±* and we have a r —x 1 & = ~, sin (2* —^— + A ± *] but 7T = 2*. Transformations; C8 NATURAL PHILOSOPHY. and th
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