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Posted by on May 29, 2000 19:07:50 UTC

Dear Sir,
I am an amateur astronomer and I would like to know to measure the surface deformation of an astronomic Pyrex-mirror.
The characteristic features of this mirror are as follows:
- diameter 520 mm
- diameter of the hole 115 mm
- thickness 79 mm
- F=2000
The mirror lies on 9 oscillating axial bearings (3+3+3 copper feet, whose diameter is 10 mm) and 6 copper radial bearings of which the surface of contact with the cylindrical part of the mirror is circa 10x10 mm.
the radial bearings are placed along the vertex of a hexagon, two thirds away from the optical surface.
I would also like measure the above-mentioned surface deformations as a function of the zenithal angle of the optical axis as well as a function of the temperature (which varies during the year from -10C to +40C).
Yours Sincerely
Walter Benedetti

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