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Page 222
If the air be still , or practically still , as during the Cherbourg review , the sound is heard at equal distances in directions which are inclined to one another at an angle of 110 ° . If the wind be a light one , the sound may be ...
If the air be still , or practically still , as during the Cherbourg review , the sound is heard at equal distances in directions which are inclined to one another at an angle of 110 ° . If the wind be a light one , the sound may be ...
Page 223
DIRECTION OF SOUND . tttttt DIRECTION OF WIND . diagram , the sound - wave is supposed to advance from left to right and the wind in the opposite direction . The lines represent the positions of the wave - front at successive equal ...
DIRECTION OF SOUND . tttttt DIRECTION OF WIND . diagram , the sound - wave is supposed to advance from left to right and the wind in the opposite direction . The lines represent the positions of the wave - front at successive equal ...
Page 224
Thus , the comparative inaudibility of sound - vibrations in the direction from which the wind comes is due not so much to any enfeeblement in the vibrations as to their being lifted over the heads of observers on the surface of the ...
Thus , the comparative inaudibility of sound - vibrations in the direction from which the wind comes is due not so much to any enfeeblement in the vibrations as to their being lifted over the heads of observers on the surface of the ...
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