20487. H. R. Report No. 11. MANN’S MARINE DANGER SIGNAL. June 4, 1879. 3p.
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20487. H. R. Report No. 11. MANN’S MARINE DANGER SIGNAL. June 4, 1879. 3p.
20487. H. R. Report No. 11. MANN’S MARINE DANGER SIGNAL. June 4, 1879. 3p. Reports on an automatic signal at sea which by means of the action of the water on reefs and shoals would ring a bell or force air from a whistle. Discusses the operation and requirements of this new signal at great length and in some detail, including a similar device in use at the Graves in Boston Harbor. $10.