EPICYCLE n.
he deferent of a planet, is carried along with the deferent, and yet, by its own peculiar motion, carries the body of the planet fastened to it round its proper center. The schoolmen were like astronomers which did feign eccentries, and epicycles, and such engines of orbs. Bacon.
EPICYCLIC a.
Pertaining to, resembling, or having the motion of, an epicycle. Epicyclic train (Mach.), a train of mechanism in which epicyclic motion is involved; esp., a train of spur wheels, bevel wheels, or belt pulleys, in which an arm, carrying one or more of the wheels, sweeps around a center lying in an axis common to the ot…
EQUATION n.
e added to, or taken from, its position as calculated on the hypothesis of a mean uniform motion, in order to find its true position as resulting from its actual and unequal motion. Absolute equation. See under Absolute. -- Equation box, or Equational box, a system of differential gearing used in spinning machines for…
EQUATORIAL n.
An instrument consisting of a telescope so mounted as to have two axes of motion at right angles to each other, one of them parallel to the axis of the earth, and each carrying a graduated circle, the one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed,…