taffrail log

English

Noun

taffrail log (plural taffrail logs)

1. (nautical) A mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water; usually consists of a propeller, a reading unit and a stiff line connecting them.

Synonyms

• patent log

Translations

nautical speed measuring device

• Finnish: laahusloki, patenttiloki
• Hebrew: לוֹג פָּטֶנְטִי (he) m (log patenti)
• Russian: вертушечный лаг (vertušečnyj lag), гакабортный буксируемый лаг (gakabortnyj buksirujemyj lag)

See also

• chip log