## Notes on astronomical spectroscopic instrumentation and techniques |

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A/mm 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 diameter differential diffraction distance Doppler effect dv/dR equal equation error exposure Figure flexure displacement flexure variation focal ratio focus formula Fraunhofer given glass graph Hartmann hour angle inches incident instrument intensity km per sec km/sec lenses Lick Observatory light passes linear dispersion maxima medium meridian micrometer minimum deviation mirror motion 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