Abstract

The Wright telescope is a variation of the Schmidt design which uses a corrector plate at the focus and whose primary mirror is an oblate spheroid. A null test for the mirror is described, which is a modification of the Foucault test, and which makes use of the properties of a particular reference ellipse.

© 1966 Optical Society of America

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References

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  1. F. B. Wright, Publ. Astron. Soc. Pacific 47, 300 (1935); Amateur Telescope Making—Advanced (Scientific American, Inc., New York, 1952), pp. 401–409; see also Y. Väisälä, Astroni Nachr. 259, 198 (1936).
    [CrossRef]
  2. E. H. Linfoot, Recent Advances in Optics (Oxford University Press, London, 1955), pp. 272–274.

1935 (1)

F. B. Wright, Publ. Astron. Soc. Pacific 47, 300 (1935); Amateur Telescope Making—Advanced (Scientific American, Inc., New York, 1952), pp. 401–409; see also Y. Väisälä, Astroni Nachr. 259, 198 (1936).
[CrossRef]

Linfoot, E. H.

E. H. Linfoot, Recent Advances in Optics (Oxford University Press, London, 1955), pp. 272–274.

Wright, F. B.

F. B. Wright, Publ. Astron. Soc. Pacific 47, 300 (1935); Amateur Telescope Making—Advanced (Scientific American, Inc., New York, 1952), pp. 401–409; see also Y. Väisälä, Astroni Nachr. 259, 198 (1936).
[CrossRef]

Publ. Astron. Soc. Pacific (1)

F. B. Wright, Publ. Astron. Soc. Pacific 47, 300 (1935); Amateur Telescope Making—Advanced (Scientific American, Inc., New York, 1952), pp. 401–409; see also Y. Väisälä, Astroni Nachr. 259, 198 (1936).
[CrossRef]

Other (1)

E. H. Linfoot, Recent Advances in Optics (Oxford University Press, London, 1955), pp. 272–274.

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Figures (2)

Fig. 1
Fig. 1

The Wright telescope. Here F is the focal length of the system, and M (practically the same) is the distance from the mirror to the focus. The distance E between the corrector and the mirror should equal F, unless a small space is needed, as for a plate-holder.

Fig. 2
Fig. 2

Null Test for the oblate spheroidal Wright telescope mirror. Here F is the focal length and cF = E is the distance between the corrector plate and the mirror. Points A and B are conjugate foci of the reference ellipse. When c = 1, then OA = OB = OV = F.

Equations (4)

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w = ( 1 - a ) r 2 / 4 M + ( 1 - b ) r 4 / 32 E M 2 + ,
w = r 2 / 4 F + r 4 / 32 c F 3 ,
( w - c F ) 2 / c 2 F 2 + r 2 / 2 c F 2 = 1.
h = ( A a 0 2 r 2 - r 4 ) / 64 F 3 ,

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