This line is also called the line of colliniation ; but we shall hereafter, for the sake of brevity, call it the sight-line. 6. The spider lines, or threads, are usually stretched across a ring, or diaphragm, which is placed in a tube which slides in theanbsp;...
Title | : | A Manual of Spherical and Practical Astronomy: Theory and use of astronomical instruments, method of least squares |
Author | : | William Chauvenet |
Publisher | : | - 1863 |
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