David Dunlap Observatory
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The David Dunlap Observatory (DDO) is an astronomical observatory site in Richmond Hill, Ontario, Canada. Established in 1935, it was owned and operated by the University of Toronto until 2008. It was then acquired by the city of Richmond Hill, which provides a combination of heritage preservation, unique recreation opportunities and a celebration of the astronomical history of the site. Its primary instrument is a 74-inch (1.88 m) reflector telescope, at one time the second-largest telescope in the world, and still the largest in Canada. Several other telescopes are also located at the site, which formerly also included a small radio telescope. The scientific legacy of the David Dunlap Observatory continues in the Dunlap Institute for Astronomy & Astrophysics, a research institute at the University of Toronto established in 2008.
The 74-inch (1.9 m) telescope (left) and Administration Building (right) at the David Dunlap Observatory
Concept sketch of David Dunlap Observatory
David Alexander Dunlap, c. 1920
Construction of the observatory's dome in Newcastle upon Tyne, after which it was dismantled and shipped to Richmond Hill
Grubb Parsons
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Grubb Parsons was a historic manufacturer of telescopes, active in the 19th and 20th centuries. They built numerous large research telescopes, including several that were the largest in the world of their type.
Base of the 12-inch refracting telescope at V. P. Engel'gardt Astronomical Observatory, built in 1875 by the Grubb Telescope Company.
The 27-inch refractor at the Vienna Observatory, built by the Grubb Telescope Company in 1878.
The 74-inch for David Dunlap Observatory, under construction in Grubb Parsons' workshop in Newcastle