Centre of Percussion.
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.
Pump in which liquid is withdrawn by giving it a high rotational speed and allowing it to escape tangentially.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.
Short period variable stars whose magnitudes vary in the course of a few days. Rigel, Canopus, Antares are examples.
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