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A/mm A9 cos 9 absorption angular dispersion aperture astronomical Astronomical Spectroscopy axis of flexure beam camera lens cassegrain Cassegrain Reflector collimator lens comparison lines computed considered constant Cornu-Hartmann correcting plate cos2r coude curvature curve determination differential diffraction distance Doppler effect equal equation error exposure Figure flexure displacement flexure variation focal ratio focus formula Fraunhofer given glass graph grating spectrograph Hartmann hour angle inches incident instrument km per sec km/sec lenses Lick Observatory light passes linear dispersion maxima medium meridian minimum deviation mirror mounted Objective Prism observed one-prism perpendicular photographic plate position primary focal line prism prism spectrograph purity quartz radial velocity radius reflection refracted ray refracting surface region resolving power rotation Schmidt cameras secondary focal line simple harmonic motions single-prism slit width solar spectrum spectra spectral lines spectrograph spectroscope standard table star telescope temperature change tion wave wave-front wave-length