Talk:Hale telescope

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Source[edit]

hello Wikipedia I added a description of the Hale Telescope, partly copied from our website, with permission. Andrew Pickles Associate Director Operations, Caltech Optical Observatories pick@caltech.edu

Mirror[edit]

Forty plus years ago I read the educational comic book about the Palomar Observatory and the Hale Telescope. They told about the first attempt at making the mirror, which was the biggest piece of glass Corning had ever made. The heat of the big pot of glass was so hot that the ceiling was damaged and two bricks fell into the mix. A friend of mine saw this piece of glass in Corning about 15 years ago, and she said it looks perfectly clear, but the astronomers rejected it, so a second glass blank was made and shipped to California. This should be in the article.  Randall Bart   Talk  00:36, 7 April 2009 (UTC)

Since it's a mirror clarity isn't a concern, just dimensional stability. In any case, the story is true and here's a source: [1]   Will Beback  talk  07:40, 7 April 2009 (UTC)
I went ahead and added a bit about the mirror and also about the coating process. GFee free to revise and improve.   Will Beback  talk  08:05, 7 April 2009 (UTC)
Great addition. --ChetvornoTALK 04:56, 9 April 2009 (UTC)

85.24.143.128 (talk) 15:23, 6 January 2010 (UTC) hmm..."2 millionths of an inch", isn't that 50 nm? [Please remove this comment after correction]

I remember reading about 35 years ago that during transport of the mirror by rail it was protected by a bullet-proof case. Upon arrival near the observatory they found dozens of bullet holes in the case! Interesting material but probably not significant enough to place in the article. If someone thinks it might be deserving of inclusion then comment here and I will look up the documentation.Linktex (talk) 19:21, 9 January 2014 (UTC)

Discoveries[edit]

Please could somebody add information about important discoveries that have been made primarily with this telescope? Thank you.—RJH (talk) 16:35, 8 October 2009 (UTC)

Mirror redux[edit]

Consolidated material about the mirror into section and expanded[2]. Deleted the second paragraph since it is wrong about the 200 inch being the 2 largest single mirror, its about the 8th largest according to List of largest optical reflecting telescopes. The rest of the paragraph is unref'ed and more overall descriptive of large mirrors in general than about the 200 inch. It could be added to Reflecting telescope or some other article dealing with large mirrors. Fountains of Bryn Mawr (talk) 17:10, 23 October 2009 (UTC)

Yes, the section should have said that the Hale and BTA-6 are the largest telescopes in the world with traditional rigid mirrors. It is correct that there are about 8 telescopes with larger single mirrors. As the deleted text explained, these larger mirrors are too big to hold their shape as they are rotated, so their shape is controlled by moveable mounts with complicated computer controlled actuators that compensate for the sagging of the mirror as it is turned. These are essentially flexible mirrors. The Hale and the BTA-6 are notable as the largest telescopes with rigid mirrors that don't require dynamic computer figure correction. However, as you say the material was unsourced. I'll try to find sources. --ChetvornoTALK 04:30, 24 October 2009 (UTC)
Restored deleted paragraph with supporting citations. --ChetvornoTALK 10:26, 11 November 2009 (UTC)