Editing David Dunlap Observatory (section)

==Contemporaries==
The DDO main instrument was the second-largest telescope in the world when it began operation in 1935.  
Some of the largest telescopes in 1935 were:

{| class="wikitable" style="font-size: 90%; text-align: center;"
|-
! style="background: #BBEEFF;" | #
! style="background: #BBEEFF;" | Name /<br /> Observatory
! style="width:40px; background: #BBEEFF;" | Image
! style="background: #BBEEFF;" | Aperture
! style="background: #BBEEFF;" | Altitude
! style="background: #BBEEFF;" | First <br />Light
! style="background: #BBEEFF;" | Special advocate
|-
|-
! 1
| [[Hooker Telescope]] <br /> [[Mount Wilson Observatory|Mount Wilson Obs.]], United States
| [[File:100inchHooker.jpg|30px]]
| 100&nbsp;inch <br /> 254&nbsp;cm
| 1742 m <br/>(5715&nbsp;ft)
| 1917
| [[George Ellery Hale]] <br/> [[Andrew Carnegie]]
|- bgcolor="efefef"
!2
| David Dunlap Observatory, Canada
| [[File:Dunlap Observatory.jpg|40px]]
| 74&nbsp;inch <br /> 188&nbsp;cm
| 224 m <br />(735&nbsp;ft)
| 1935
| [[Clarence Chant]]
|-
!3
| Plaskett telescope <br/>[[Dominion Astrophysical Observatory|Dominion Astrophysical Obs.]], Canada
| [[File:Dominion Astrophysical Observatory front.jpg|40px]]
| 72&nbsp;inch <br /> 182&nbsp;cm
| 230 m <br /> (755&nbsp;ft)
| 1918
| [[John S. Plaskett]]
|-
!4
| 69-inch Perkins Telescope<ref>{{cite web|url=http://www.perkins-observatory.org/history.html |title=History |publisher=Perkins Observatory |date=1 August 1998 |access-date=5 March 2012 |url-status=dead |archive-url=https://web.archive.org/web/20060928085124/http://www.perkins-observatory.org/history.html |archive-date=28 September 2006 }}</ref><br/>[[Perkins Observatory]], United States 
| 
| 69&nbsp;inch <br />175&nbsp;cm  
|  
|1931
| [[Hiram Perkins]] 
|-
!5
| 61" reflector<ref>{{Cite web |url=http://seti.harvard.edu/oseti/targeted/photos.htm |title=Optical seti photographs |access-date=6 October 2010 |archive-url=https://web.archive.org/web/20100627200005/http://seti.harvard.edu/oseti/targeted/photos.htm |archive-date=27 June 2010 |url-status=live }}</ref><br/>[[Oak Ridge Observatory]], United States
| 
| 61&nbsp;inch <br /> 155&nbsp;cm 
| 
| 1933
|
|}
Later in the 1930s, an [[Otto Struve Telescope|82-inch telescope]] was completed at [[McDonald Observatory]] in Texas. By the end of the next decade Dunlap's was still the fourth largest, due to the opening of the [[Hale Telescope]] in 1948. However, the telescope has remained the largest telescope in Canada until 1992, when the somewhat unique UBC-Laval LMT 2.65 m (104&nbsp;in) came online. However, the LMT is a zenith telescope that only points up, using a liquid metal mirror.