Talk:40-foot telescope

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WikiProject Astronomy (Rated Start-class, Mid-importance)
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There are a couple of images at and - unclear whether these can be used on Wikipedia. Also, original mirror now at the science museum,, but URL does not currently work. Mike Peel (talk) 22:13, 22 November 2008 (UTC)

The images are covered by the database right component of UK copyright law. Mike Peel (talk) 08:54, 23 November 2008 (UTC)

Calling a telescope by its length rather than diameter?[edit]

Modern parlance is to refer to telescopes by their diameter. The 40-foot name here is (presumably!) the length of the tube. It would be interesting to have something in the article which discussed why. Has common usage just changed over time? -- RoySmith (talk) 16:33, 27 November 2008 (UTC)

Yes; telescopes at that time were known by the length of their tube rather than the diameter of their mirror, see e.g. [1]. Mike Peel (talk) 09:27, 28 November 2008 (UTC)


I disagree with the merger: the two articles focus on different things, one on a telescope the other on a building/observatory, and I don't think a combined article would work well. I hope that the building article can be expanded in the future. Mike Peel (talk) 10:21, 22 March 2009 (UTC)

Johann Alexander Herschel[edit]

The NMH website [2] lists "Johann Alexander Herschel" as one of the creators of this telescope. I took this to be John Herschel, but as was pointed out "John Herschel was born in 1792 and can hardly have helped build a telescope finished in 1789." [3]. Does anyone know who Johann Alexander Herschel was? Mike Peel (talk) 21:54, 21 November 2009 (UTC)