An instrument for measuring the rigger-spread of a boat

摘要

An instrument for measuring the rigger-spread of a boat has an elongate casing 1 for support athwartships of the boat with a shoulder 2 of the casing 1 abutting the outside of the gunwale 4 opposite the rigger 5 and a slidingly adjustable shoulder 6 abutting the opposite gunwale 9. A measuring tape 10 is extendable longitudinally from the casing 1 to the oarlock 14 of the rigger 5 to give a reading of spread, the extendable length being limited in dependence upon the spacing between the shoulders 2,6 of the casing 1 such that this length is increased or decreased by half the amount of any respective increase or decrease of that spacing. Limitation of the extendable length involves a mechanism in which the two ends 18,19 of a flexible strip 15 or wire are secured to the sliding shoulder 6 and the casing 1 so as to define a loop that is caught by a hook 16 of the tape 10 in limiting tape extension.