""Well, then, Haley, how will you trade?" said Mr. Shelby, after an uneasy interval of silence. "Well, haven’t you a boy or gal that you could throw in with Tom?" "
A sound made by tapping on the hull of a ship will be reflected from the sea bottom, and by measuring the time interval between the taps and the receipt of the echoes the depth of the sea at that point can be calculated.
""Well, then, Haley, how will you trade?" said Mr. Shelby, after an uneasy interval of silence. "Well, haven’t you a boy or gal that you could throw in with Tom?" "
A sound made by tapping on the hull of a ship will be reflected from the sea bottom, and by measuring the time interval between the taps and the receipt of the echoes the depth of the sea at that point can be calculated.