AXIS n.
system of parallel chords of a curve; called a principal axis, when cutting them at right angles, in which case it divides the curve into two symmetrical portions, as in the parabola, which has one such axis, the ellipse, which has two, or the circle, which has an infinite number. The two axes of the ellipse are the ma…
BEAM n.
the beam (Naut.), in an arc of the horizon between a line that crosses the ship at right angles, or in the direction of her beams, and that point of the compass toward which her stern is directed. -- Beam center (Mach.), the fulcrum or pin on which the working beam of an engine vibrates. -- Beam compass, an instrume…