Evening Republican, Volume 22, Number 115, Rensselaer, Jasper County, 16 May 1919 — Submarine Signals. [ARTICLE]

Submarine Signals.

During the war. as is well known, submarine sound-signaling made great strides. In Schiffbau an account Is given of a device employed in Germany. In this device the receiver is secured to the outer layer of the ship's hull from inside and Is filled with water. the liquid being in contact with the outer plating of the vessel. The essential point in this device appears to be that the means for producing the sound are placed externally- on the wall of the liquid tank, whereas in most cases the Sounding device J httHFrto li&bn arranged inside the tank or receiver. Another special feature is an automatic arrangement for maintaining constant, or adjusting, the level of the water, which can" be manipulated externally. —Scientific American. ,