2. (Logic) That process by which a number of isolated facts are brought under one conception, or summed
up in a general proposition, as when Kepler discovered that the various observed positions of the planet
Mars were points in an ellipse. "The colligation of facts." Whewell.
Colligation is not always induction, but induction is always colligation. J. S. Mill. Collimate (Col"li*mate) v. t. [imp. & p. p. Collimated; p. p. & vb. n. Collimating.] [See Collimation.]
(Physics & Astron.) To render parallel to a certain line or direction; to bring into the same line, as the
axes of telescopes, etc.; to render parallel, as rays of light.
Collimating eyepiece, an eyepiece with a diagonal reflector for illumination, used to determine the
error of collimation in a transit instrument by observing the image of a cross wire reflected from mercury,
and comparing its position in the field with that of the same wire seen directly. Collimating lens
(Optics), a lens used for producing parallel rays of light.
Collimation (Col`li*ma"tion) n. [Cf. F. collimation, fr. a false reading (collimare) for L. collineare to
direct in a straight line; col- + linea line. Cf. Collineation.] The act of collimating; the adjustment of the
line of the sights, as the axial line of the telescope of an instrument, into its proper position relative to
the other parts of the instrument.
Error of collimation, the deviation of the line collimation of an astronomical instrument from the position
it ought to have with respect to the axis of motion of the instrument. Line of collimation, the axial
line of the telescope of an astronomical or geodetic instrument, or the line which passes through the
optical center of the object glass and the intersection of the cross wires at its focus.
Collimator (Col"li*ma`tor) n.
1. (Astron.) A telescope arranged and used to determine errors of collimation, both vertical and horizontal.
Nichol.
2. (Optics) A tube having a convex lens at one end and at the other a small opening or slit which is at
the principal focus of the lens, used for producing a beam of parallel rays; also, a lens so used.
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