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