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The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.
The Merz refractor was the biggest telescope in the United States in the early 1840s. [11] In 1871, the Observatory came under the control of the University of Cincinnati and in 1873 it was transferred from Mt. Adams to Mt. Lookout in order to escape the smoke and dirt of the city, where it remains today. [12]
Largest in operation [7] James Lick telescope Lick Observatory: Mount Hamilton, California, USA: 91 cm (36") 17.6 m: 1888 William Thaw Telescope Allegheny Observatory: Pittsburgh, Pennsylvania, USA: 76 cm (30") 14.1 m: 1914: Brashear made, photographic [8] Leander McCormick Observatory: Charlottesville, Virginia, USA: 66 cm (26") 9.9 m: 1884 ...
The glass blanks for what would become Yerkes Great Refractor were made in Paris, France by Mantois and delivered to Alvan Clark & Sons in Massachusetts where they were completed. [12] Clark then made what would be the largest telescope lens ever crafted and this was mounted to an Equatorial mount made by Warner & Swasey for the observatory. [12]
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The 69-inch (1.8 m) telescope at Perkins was immediately replaced with a 32-inch (810 mm) cassegrain reflector telescope. It was donated by Michael R. Schottland, an entrepreneur from Martinsville, Virginia. At that time it was the largest privately owned telescope in the United States. Currently it is one of the three largest telescopes in Ohio.