Null test for wright telescope mirrors.
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.
Everhart
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Department of Physics, The University of Connecticut, Storrs, Connecticut 06268, USA.