Telescope Making Techniques, Volume 1William Charles Communications, 1977 - Telescopes |
Common terms and phrases
abrasive accuracy accurate adjusted aluminum amateur amateur telescope maker amount angle aperture aspherical astigmatism autocollimation bevels blank carbo Cassegrain cement center of curvature clamp collimation coma concave cylinder diameter diffraction pattern disc distance drill drill-press drive pin edge epoxy equations error eyepiece facets figuring flat focal length focal ratio focus formula Foucault Foucault test glass grinding and polishing grit hole inch knife-edge lathe lens lenses machine measured mercury metal method micrometer motor off-axis optical axis optical system parabolic paraboloid piece pitch plane mirror plate primary mirror R.I. table radii radius of curvature ratio reflecting telescope reflector removed result Ritchey-Chretien rotating sagitta screw secondary setup side side-throw speed spherical aberration spherical mirror spherical surface spherometer spindle star stroke telescope maker template tester thickness tion tolerance tool trepanning tube turned turntable vertical warping harness wavelength zone