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Making and Using Metal ToolsClark
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adjustment aluminum amateur angle aperture astigmatism astronomical band brass camera Carbo casting cell center of curvature chuck circle clock concave convex Corning Glass correct correcting lens curve diameter disk dome drill drive error exit pupil eyepiece face field filter flat focal length focal ratio focus fringe gear give glass grinding hole inch knife-edge lathe lens lenses light machine magnitude main tube measure metal method mirror mold motor mounting objective observation Observatory obtained optical pendulum percent photographic piece pitch plane plate polar axis polishing position prism Pyrex quartz radius of curvature rays reflector refractive refractive index refractor ring Ronchi test rotation rouge sand Schmidt camera scratches screw setting circles shadow shaft shown in Figure shows side slide slit spherical spherometer spindle square star stroke surface telescope temperature thickness thread tool turned edge wheel worm worm gear zone