American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 339
nt writer,it has not passed the experimental stage. The manner of its operation will be apparent. A bell, B, is lowered into thesea, by means of a rope and pulley, into a position where it may be struck by thehammer h, which is movable from shipboard. The receiver is along, bent, trumpet-shaped… … The sounds produced by the strokes of the hammer upon the bell are propagatedby the water to the mouth of the tube and thence to the ear of a listener at the re-ceiving ship. Experiments have shown that signals can be transmitted in this way to a dis-tance of about half a mile, but at a distance of…
Telegraph
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