A device for continuously indicating on a galvanometer the depths of the ocean.
A method of preventing in a great measure friction of water against the hull of a ship and incidentally preventing fouling by barnacles.
A telephone receiver whereby the vibrations of the diaphragm are considerably amplified.
Two methods of "space" telegraphy at sea.
An improved and extended string telephone.
Devices and method of talking through water for considerable distances.
Sound-bridge for measuring resistance of tubes and other materials for conveying sound.
A method of testing a magnet to ascertain the existence of flaws in the iron or steel composing the same.
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