Refracting Telescope

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“Suppose the object o to be at such a distance, that the rays of light from it pass in parallel lines, p, p, to the great reflector, r, r. this reflector being concave, the rays are converged by reflection, and cross each other at a, b which the image is inverted. The rays then pass to the small mirror, b, which being also concave, they are thrown back in nearly parallel lines, and having passed the aperture in the centre of the great mirror, fall on the plano-convex lens e.” -Comstock 1850


J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 256


TIFF (full resolution)

2400×713, 161.9 KiB

Large GIF

1024×304, 33.5 KiB

Medium GIF

640×190, 18.3 KiB

Small GIF

320×95, 7.1 KiB