alb3823938
Chip Log, Navigational Tool
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Titre: Chip Log, Navigational Tool
Légende: Voir la traduction automatique
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.
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.
Crédit: Album / Science Source
Autorisations: ? Autorisation de modèle: Non - ? Autorisation de propriété: Non
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Taille de l'image: 3600 × 4590 px | 47.3 MB
Taille d'impression: 30.5 × 38.9 cm | 1417.3 × 1807.1 in (300 dpi)
Mots clés: DIVERS • ILLUSTRATION • NAVIGATION • SABLIER
