File:1911 Britannica - Astronomy - Telescope.svg

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English: Practical Astronomy. Let OF be a section of the telescope, MN being its object glass. Let the parallel dotted lines represent rays of light emanating from the object to be observed, which, for our purpose, we regard as infinitely distant, a star for example. These rays come to a focus at a point F lying in the focal plane of the telescope.
Illustration from 1911 Encyclopædia Britannica, article Astronomy.

Date

24 October 2024

Source

Encyclopædia Britannica Eleventh Edition, Vol. 2, Page 807

Author

Encyclopædia Britannica, 1911

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This image comes from the 13^th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1931. As such, this image is in the public domain in the United States.

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