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The observatory was equipped with a 12.5 inch aperture refractor, the largest telescope in Ohio, USA on its debut in 1896. [4] It was on a Warner and Swasey mounting and Brashear made the optics. [5] An 1896 document about the observatory said the Warner and Swasey mount was so well known it did no need description. [2]
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 Cincinnati Observatory, known locally as Mt. Lookout Observatory, is located in Cincinnati, Ohio (United States) on top of Mount Lookout. It consists of two observatory buildings housing an 11-inch (28 cm) and 16 inch (41 cm) aperture refracting telescope. It is the oldest professional observatory in the United States. [3]
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 ...
Two-element refracting telescopes were extensively used in 19th century observatories despite their smaller apertures than metal, and later glass, mirror telescopes. The technology for silver-coating glass mirrors, more reflective than speculum metal and not subject to tarnishing, was developed in the mid-19th century but was slow to be adopted.
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.