The Online Books Page

Signals

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• Visual sweep width determination for three visual distress signalling devices / (Washington, D.C. : U.S. Department of Transportation, U.S. Coast Guard, Office of Research and Development ; Springfield, Va. : National Technical Information Service [distributor, 1986]), by G. L. Hover, R. Q. Robe, United States. Coast Guard. Office of Research and Development, Inc Analysis & Technology, and U.S. Coast Guard Research & Development Center (page images at HathiTrust)
• Signalling ... written by an officer of the regular army. (London, Murray, 1916), ed. by E. John Solano (page images at HathiTrust; US access only)
• A system of general signals for night and day whereby merchant vessels may communicate at a distance by means of the common colours of the ship, and with four lanterns by night, without going out of their course. (Boston : Wells and Lilly, 1817), by Charles Lenox Sargent (page images at HathiTrust)

Items below (if any) are from related and broader terms.