Chip log
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A chip log, also called common log, ship log, or just log, is a navigation tool mariners use to estimate the speed of a vessel through water. The word knot, to mean nautical mile per hour, derives fro
Model of chip log and associated kit. The reel of log-line is clearly visible. The first knot, marking the first nautical mile is visible on the reel just below the centre. The timing sandglass is in the upper left and the chip log is in the lower left. The small light-coloured wooden pin and plug form a release mechanism for two lines of the bridle. From the Musée de la Marine, Paris.
Chip log in the 18th century
Taffrail Log Rotator
Negus Taffrail Log
Taffrail
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In naval architecture, a taffrail is the handrail around the open deck area toward the stern of a ship or boat. The rear deck of a ship is often called the afterdeck or poop deck. Not all ships have a
Chip log
…patent logs or taffrail logs, operating on physical principles in a manner similar to a car's odometer by towing a vane or rotor from the stern (or taffrail) by a long line, were developed in the eighteenth century (or earlier) but became practical in the nineteenth century and replaced the traditional chip…
William Heysmann Overend painting: Naval Captain on the Poop deck taffrail
Weather deck of the Swedish 17th-century warship Vasa looking aft toward the sterncastle, with a hand carved taffrail
Gdańsk "Lew" a seventeenth-century galleon replica, stern with wooden carved taffrail
Prins Willem stern with wooden carved taffrail