A manual of spherical and pratical astronomy
This line is also called the line of colUmation; 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 pratical astronomy |
| Author | : | William Chauvenet |
| Publisher | : | - 1864 |
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