Excerpt from A Manual of Spherical and Practical Astronomy, Vol. 2: Embracing the General Problems of Spherical Astronomy, the Special Applications to Nautical Astronomy, and the Theory and Use of Fixed and Portable Astronomical Instruments; Theory and Use of Astronomical Instruments; Method of Least Squares

The line of sight is he straight line drawn from the thread through the optical centre of the objective; for this line repro sents the direction of a,distant point (as a star), when the tele scope is so directed that an image of the point is formed at the thread. This line is also called the line of collimation; but we shall hereafter, for the sake of brevity, call it the sight-zine.

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