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The 27-inch refractor at the Vienna Observatory, built by the Grubb Telescope Company in 1878. In 1868 the company completed the 48-inch (1.2 m) Great Melbourne Telescope, one of the last large instruments to use a speculum primary mirror. It was the second largest telescope in the world at that time, and the largest that was fully steerable.
It used a 48-inch (120 cm) diameter primary mirror with a 40-foot-long (12 m) focal length (hence its name "Forty-Foot"). It was the largest telescope in the world for 50 years . It may have been used to discover Enceladus and Mimas , the 6th and 7th moons of Saturn .
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Light path in a Cassegrain reflecting telescope. The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture.
McDonald Obs. 82 inch i.e. Otto Struve Telescope: 82 inch 208 cm 1939 USA: David Dunlap Observatory: 74 inch 188 cm 1935 Canada: Plaskett telescope Dominion Astrophysical Obs. 72 inch 182 cm 1918 Canada: 69-inch Perkins Telescope [10] Perkins Observatory: 69 inch 175 cm: 1931–1964 USA: Wyeth 61" reflector [11] Oak Ridge Observatory: 61 inch ...
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