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Chip Log, Navigational Tool

Colorized drawing of a chip log and hour glass timer. This is a navigation tool used by mariners to estimate the speed of a vessel through water. A chip log consists of a wooden board attached to a line (the log-line). The log-line has a number of knots tied in it at uniform spacings. The log-line is wound on a reel to allow it to be paid out easily in use. Originally, the distance between marks was 7 fathoms or 42 feet used with a sandglass with a 30 second running time. Later the distance was refined to 47 feet, 3 inches for a standard glass of 28 seconds.
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Title:
Chip Log, Navigational Tool
Caption:
Colorized drawing of a chip log and hour glass timer. This is a navigation tool used by mariners to estimate the speed of a vessel through water. A chip log consists of a wooden board attached to a line (the log-line). The log-line has a number of knots tied in it at uniform spacings. The log-line is wound on a reel to allow it to be paid out easily in use. Originally, the distance between marks was 7 fathoms or 42 feet used with a sandglass with a 30 second running time. Later the distance was refined to 47 feet, 3 inches for a standard glass of 28 seconds.
Credit:
Album / Science Source
Releases:
Model: No - Property: No
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Image size:
3600 x 4590 px | 47.3 MB
Print size:
30.5 x 38.9 cm | 12.0 x 15.3 in (300 dpi)
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