or is that the siren may be installed at Number of Cylinders. one-fifth the cost of an air-sound- Fig. 8 ing device and that its maintenance cost is at least one-tenth. When an air compressor device is WGI I2IC A8D?PL used it is necessary to keep the motor running almost con- Gr 0h == Fay, web are… … The siren can be set in motion from various parts of the ship by merely pressing a button, when it gives a peculiar, penetrating sound, universally known to seamen as a warn- ing signal. Hundreds of electric sirens are used by the United States Government on submarines and the like. 82d- 25L It is…
Shipbuilding -- Periodicals · Shipbuilding industry -- Periodicals
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
