, in Astronomy. See Cygnus.
SWALLOW's-Tail, in Fortification, is a single Tenaille, which is narrower towards the place than towards the country.
SWING-Wheel, in a royal pendulum, is that wheel which drives the pendulum. In a watch, or balance clock, it is called the crown-wheel.
SYDEREAL Day, or Year. See Sidereal.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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