Measuring the angles and pyramidal error of high-precision prisms o1YX^-<[F  
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High-precision prisms, having maximum angle tolerances )Y}t~ Zfx  
of 1 to 3 arcsec, find increasing application in optical metrology. VlRN  
Reported interferometric techniques for measuring SdBv?`u|g  
the wedge angles of such prisms achieve a precision of up cOcF 
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to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques ;0O3b  
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric ]]`hnzJX  
methods have made use of goniometers,2 KhAj`vOzK  
spectrometers,3 master prisms,4,5 and collimators.6 However, )dgXS//Y  
in the literature there are few reported methods for KRQKL`}}  
measuring the pyramidal error, and the majority rely on _Sy-&}c+ +  
visual observation,2,7,8 by which it is only possible to measure M8a^yoZn  
pyramidal errors to the order of 1 arcmin ~Ref. 8!. _O2},9L n  
In the new arrangement presented here, one can measure !ccKbw)J#  
the prism angle and the pyramidal error separately or in {[hH: \  
combination. This is possible because the measurements /+pbO-r