Nautical words

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Napier's Curve, Diagram. Curved line drawn on a specially designed diagram and passing through a limited number of points on which deviation of compass has been ascertained. This facilitates the determination of deviations on points for which no observa­tion has been made.

Napier's Rules of Circular Parts. Diagrammatic arrangement of five parts, or their complements, of a right-angled or quadrantal spherical triangle, the right angle or 90° side being disregarded, in five sections of a circle. If these be put in the rotation of their occurrence, an unknown part can be found from the other parts; the rule being that sine of middle part equals product of tangents of adjacent parts, or product of cosines of opposite parts.

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