The previous page is sending you to https://www.alamy.com/a-manual-of-spherical-and-practical-astronomy-embracing-the-general-problems-of-spherical-astronomy-the-special-applications-to-nautical-astronomy-and-the-theory-and-use-of-fixed-and-portable-astronomical-instruments-with-an-appendix-on-the-method-of-least-squares-to-the-right-will-be-reflected-into-coincidence-with-the-directobject-and-the-angular-distance-of-the-two-objects-is-given-bythe-reading-corrected-for-the-index-error-when-the-centralmirror-becomes-nearly-perpendicular-to-the-line-mm-the-prismintercepts-the-rays-from-the-right-hand-object-this-occurswhen-the-angular-distanc-image340019832.html.

 If you do not want to visit that page, you can return to the previous page.