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RARE "TRAVERSE BOARD" NAVIGATIONAL DEVICE Dutch, Early 18th Century
Used for "dead reckoning". One-piece wooden construction, probably oak, laminated on the working side with vellum and painted green on the reverse. Round upper portion with hanging hole and compass rose comprised of 32 lines radiating from the center. Each line is drilled with seven holes for each half-hour interval of a four-hour deck watch, beginning at the center. A pin would be inserted each half-hour on the appropriate course line. Rectangular lower portion used to notate speed, marked with knots on the horizontal axis and two-hour increments on the vertical axis. Lower portion also marked "GMYLEN G", standing for "mijlen Gevaren" or "average miles sailed per hour". The sum of the resulting speed and direction vectors was computed by the ship navigator at the end of the watch and provided the captain the general position of the ship. Length 11.25". Width 6.75".

Used for "dead reckoning". One-piece wooden construction, probably oak, laminated on the working side with vellum and painted green on the reverse. Round upper portion with hanging hole and compass rose comprised of 32 lines radiating from the center. Each line is drilled with seven holes for each half-hour interval of a four-hour deck watch, beginning at the center. A pin would be inserted each half-hour on the appropriate course line. Rectangular lower portion used to notate speed, marked with knots on the horizontal axis and two-hour increments on the vertical axis. Lower portion also marked "GMYLEN G", standing for "mijlen Gevaren" or "average miles sailed per hour". The sum of the resulting speed and direction vectors was computed by the ship navigator at the end of the watch and provided the captain the general position of the ship. Length 11.25". Width 6.75".
Condition: Very well preserved. Wear to extreme edges. Toning to vellum.



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November 16, 2017 10:00 AM EST
East Dennis, MA, US

Eldred's

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