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TRAVERSE-BOARD
TRAVERSE-BOARD, a thin circular piece of board, marked with all the points of the compass, and having eight holes bored in each, and eight final pegs hanging from the center of the board. It is used to determine the different courses run by a ship during the period of the watch; and to ascertain the distance of each course. This implement is particularly useful in light and variable winds, at which time the helmsman marks the course every half hour, by fixing a peg in that point of the compass whereon the ship had advanced. Thus, if the wind is northerly at the beginning of the watch, the ship, being close-hauled on the larboard tack, will steer W.N.W. If, after the first half hour, the wind changes to N. by W. the ship will fall off to W. by N. both of these courses are marked by the helmsman upon the traverse-board, by putting in one peg for every half hour on which she steers the same course; as, one peg into W.N.W. and two pegs into W. by. N. if she sails an hour on the latter course; and so on. The lee-way and variation of the compass are afterwards allowed by the pilot, on summing up the whole.
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© Derived from Thomas Cadell's new corrected edition, London: 1780, page 297, 2003
Prepared by Paul Turnbull
http://southseas.nla.gov.au/refs/falc/1395.html