Nautical words

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Centre of Percussion. That point, in a striking mass, at which the whole force of the blow would cause no jar. In case of a bar of uniform density, revolving around one end, would be 2/3rds distant from centre of revolution.

Centre through Plate. Continuous girder going fore and aft along centre of bottom of a steel ship. Floors are attached to it on opposite sides.

Centrifugal Pump. Pump in which liquid is withdrawn by giving it a high rotational speed and allowing it to escape tangentially. Suction is provided by a partial vacuum caused by escaping liquid.

Cepheids. Short period variable stars whose magnitudes vary in the course of a few days. Rigel, Canopus, Antares are examples.

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