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Traverse board or pelorus, circa 1750
Anonymous, Netherlands
Maker:
Collectie:
NavigArte
Used for recording the compass course and distance sailed during a watch between the 16th and 19th centuries. Every half hour, the helmsman marked the course during the four-hour watch and recorded with a small pen the distance sailed per hour (speed in knots). Afterwards, the estimated position (‘dead reckoning’) was plotted on the chart.
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Pelorus or Pinncompass or Transverse board, for noting the course and distance sailed during a watch. In use from 1500 to the 1900’s. The watch set the course every half-hour during the four-hour watch and noted the distance travelled per hour and measured with the log, in the lower panel.
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