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A 12-inch refractor was moved to Yerkes from Kenwood Observatory in the 1890s. [13] Two other telescopes planned for the observatory in the 1890s were a 12-inch aperture refractor and a 24-inch reflecting telescope. [13] There was a heliostat mirror and a meridian room for a transit instrument. [13]
See also 1911britannica - there is a hint in favour of double refractor --84.178.136.47 19:37, 19 July 2005 (UTC) The double refractor was at Meudon (Paris Observatory). The Paris 1900 Exposition instrument was a simple refractor and was horizontal (see article), it was a total failure I think the glass was deformed by its own weight.
The Great Refractor was built in 1896 for the Great Industrial Exposition of Berlin. With an aperture of 68 cm (27 in), a focal length of 21 m (69 ft) and a movable mass of 130 metric tons, it is considered a masterpiece of technology. The lenses were made by C. A. Steinheil & Söhne. Since 1967, the telescope is a protected monument.
This is a list of large optical telescopes. For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes . This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time.
13-inch Astrographic Refractor (1890) Merz 12.8-inch Visual Refractor (1859-1893) (this was replaced by the 28 inch Grubb in the onion dome) Thomson 9-inch Photographic Refractor (c.1888) Sheepshanks refractor 6.7-inch (1838) (aka Sheepshanks Equatorial) 6-inch Franklin Adams Camera (1898) Shuckburgh telescope a 4.1-inch aperture Refractor (1791)
Past product lines include refractors up to 206mm in aperture, a catadioptric design of 254mm, and an astrograph of 305mm. As of the end of 2021, the company's line of telescopes (optical tubes only, consisting of objective lens, tube, and focuser) included only a 92mm refractor and a 130mm refractor, priced in the $4000–$7000 range.
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