Dominion Astrophysical Observatory, located on Little Saanich Mountain, in Saanich, British Columbia, was completed in 1918 by the Canadian Government. Proposed and designed by John S. Plaskett in 1910 with the support of the International Union for Cooperation in Solar Research, when the 72" aperture telescope was constructed, it was very briefly the largest telescope in the world.

The building that houses the telescope was built by McAlpine-Robertson Company of Vancouver for a price of $75,000. Both the building and dome, made by Warner and Swasey Co, are double walled.

The mirror weighs 1,960 pounds and was made by the St. Gobain in their Charleroi glass works in Antwerp, Belgium and shipped only a week before the start of World War 1. It was then ground in the United States at the John A. Brashear company in Pittsburg. The mirror had to be reground twice, once due to a mysterious scratch and the 2nd time due to a flaw in the grinding. This added 2 years to the completion time of the telescope, pushing the date back to 1918. The completed mirror was hauled up Little Saanich Mountain by horse and wagon.

The telescope still stands today and is open for visitors year round. Recently, an interpretive centre called the Centre of the Universe was opened.

External links

• Dominion Astrophysical Observatory (http://www.hia-iha.nrc-cnrc.gc.ca/dao/index_e.html)
• District of Saanich Significant Buildings (http://www.gov.saanich.bc.ca/visitor/structures.html) - scroll down the see the building
• Paper by John S. Plaskett on the construction of the DAO (http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1927PASP...39...88P)
• Richard A. Jarrell, The Instrument was Instrumental: Plaskett's Telescope and Canadian Astronomy between the wars (http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1993JRASC..87..218J)
• John S. Plaskett, History of Astronomy in British Columbia (http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1983JRASC..77..108P)
• Helen Sawyer Hogg, Memories of the Plaskett Era of the Dominion Astrophysical Observatory 1931–1934 (http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1988JRASC..82..328H)