Nautical words


Contraction of Moon's Semidiameter



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Contraction of Moon's Semidiameter. Apparent difference in angular values of Moon's horizontal and vertical diameters when near horizon. Due to unequal refraction. Was of importance when measuring lunar distances.

Contract Ticket 96 Coping



Contract Ticket. Document by which a shipowner contracts to carry a passenger other than a steerage passenger. Minimum value £25, or £3 25s. for every 1000 miles of voyage.

Contra Propeller. Propeller-like fitting on fore side of rudder post and close to ship's propeller. It redirects the flow of water from ship's propeller, so giving a 'ahead' reaction. 'Star' type had six blades originally; this has been reduced to two blades erected vertically.


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