atıf – Esere yazar veya lisans sahibi tarafından belirtilen (ancak sizi ya da eseri kullanımınızı desteklediklerini ileri sürmeyecek bir) şekilde atıfta bulunmalısınız.
https://creativecommons.org/licenses/by/3.0CC BY 3.0 Creative Commons Attribution 3.0 truetrue
Here is the email by which Prof. Willstrop granted CC-BY permission:
Dear Lou,
Thanks for your email, and my apologies for the delay in replying.
I agree to release the diagram of the three mirror telescope, under
the conditions that you recommend, i.e., that anyone can modify the
diagram, but they must attribute the original image to me on all
copies or derivatives. I will trust you to do whatever is
necessary.
Did you know that Karl Schwarzschild had described a system of TWO
mirrors free of spherical aberration, coma, astigmatism and with a
flat focal plane ? It has some disadvantages, such as a convex
primary mirror and a secondary mirror that is larger than the
primary, and a large central obstruction. Both mirrors must be
perforated. See Mittheilungen Sternwarte zu Gottingen, Part 10
(1905): Untersuchungen zur geometrischen Optik II Theorie der
Spiegeltelescope. This system is shown in Fig. 3 on p15.
Rumsey, N.J., Proc. Astron. Soc. Australia, Vol.2, p.22 (1971)
"Pairs of spherical mirrors as field correctors for paraboloid
mirrors" describes the Paul-Baker system and two other arrangements
which unfortunately have larger central obstruction.
My three papers on the three-mirror telescope in the Monthly Notices
of the Royal Astronomical Society were:
The Mersenne-Schmidt - a three mirror survey telescope.
MNRAS 210, 597 - 609 (1984)
The flat-field Mersenne-Schmidt. MNRAS 216, 411 - 427 (1985)
(This paper includes a photograph of a working model of 100 mm
aperture. You might have to obtain the agreement of the RAS
if you wanted to use this).
Atmospheric dispersion compensator for a wide-field three-mirror
telescope. MNRAS 225, 187 - 198 (1987).
Good luck with the article for Wikipedia.
Regards,
Roderick.
In reply to:
Hi, Prof. Willstrop!
I noticed that Wikipedia had no information on three-mirror anastigmat
designs, so I started to write one (
http://en.wikipedia.org/wiki/Three-mirror_anastigmat ). It's quite
basic at the moment, with references to the Paul and Baker papers, and
a few uses of the design in JWST, LSST, and some others.
The article would definitely benefit from a nice picture explaining
the idea. You have such a picture on your web page titled "Three
Mirror Telescope" (
http://www.ast.cam.ac.uk/about/three-mirror.telescope ), and I was
wondering if I could use it to illustrate the article.
To do this, you'd have to give permission. You could release it into
the public domain completely (no restrictions) or under one of the
creative common licenses ( https://creativecommons.org/licenses/ ).
I'd personally recommend "CC BY" which lets anyone do anything they
want with the image, but they must attribute the original image to you
on all copies or derivatives.
If you are willing to do this, you can just reply to this email with
your licensing preference and I'll do the rest, including uploading
the image and writing a description. I will include your reply under
the licensing section.
Of course, as always you are welcome to improve the article a well,
since it's Wikipedia...
Thanks,
Lou Scheffer
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