Massey's frictionless (impeller) propeller ship's log with conical end, and two additional sectioned pieces showing frictionless bearing, by John Edward Massey, London, England, c.1865 Massey's frictionless propeller ship log with conical end 1865-1879
Ship's log with line, 90 fathoms, and reel, representative of those used in the 18th and 19th century, by John Bliss and Co., New York, United States, 1857-1900 Ship's log with log-line and reel 1857-1900
Deck log and speed guage with separated register and metal bracket Deck log and speed gauge 1876-1906