A Summary of Researches in Sound Conducted in the Service of the United States

Cover A Summary of Researches in Sound Conducted in the Service of the United States
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And steaming about two miles, the sound was heard on the tower during twelve minutes and at the foot of the cliff' during five and one-half minutes, making a difference of six and a half minutes in favor of audition on the tower. Previous to this experiment the wind had veered one point to the west, bringing the direction of the sound to the observers in less direct oppo- sition to the wind than in the last experiment.
The siyth experiment. In this case the steamer was directed to proceed > in
...the opposite direction, or against the wind, so that the sound of the whistle would reach the ear of the observers in the same direction as that of the wind. It started at 12:19 p. M. And proceeded two and one- sixth miles ; the whistle was heard during thirteen minutes on the top of the tower, and at the bottom of the cliff during precisely the same time, the difference between the top of the tower and the bottom of the cliff in this case being nothing.
The vessel having again been called off on other duty the seventh ex- periment was made the 1st of September.


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