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Scientific American, Vol. 89, No. 5 (1903) (1903)
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h, the interrupters are supplied Experiments, have been made in the North Sea with with a mechanism enabling the operator to open or two steamers, one furnished with the fog signal and close the valves at will. Around the ring of the indi- the other without it. The last was ordered to give cator… … States. The experiment was not, however, carried to a conclusion, THE BECEIVER, © 1903 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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