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absorption bands absorption spectra adjustment aluminium angle angle of incidence Ångström aperture apparatus Astrophys beam bolometer bright bromide cadmium calcite carbon centre collimator components compounds curve deviation diffraction discharge dispersion distance electrodes emission emulsion equal equation eyepiece Fabry fluorite focussed Fraunhofer lines fringes gases given glass grating hydrogen inch index of refraction instrument intensity interference investigation iron Journ Kayser layer length lens light means measured mercury metal method metres Michelson millimetre mounted normal observed obtained parallel pass Phil phosphorescence photographic Phys plane plate platinum polarised poles position possible potassium prism quartz radiation rays refraction region resolving power Rowland salt screw seen shown in Fig silver silver bromide slit sodium solution solvent spark spectroscope spectrum lines substances surface telescope temperature thallium thickness triplets ultra-violet vacuum tube values vapour visible wave wave-lengths width wire