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angle of exit Angstrom unit Arons-Lummer lamp Baeyer blackening concave grating Crossed Plates crossed with Plate crossing the spectra curves deviation different observers direct current discrepancies among different discriminate displaced distribution of intensities doubt echelon grating echelon spectroscope echelon spectrum Fig eliminated examined existence Fabry-Perot air plate faint lines focal length Gale and Lemon Galitzin galvanometer deflections Gmelin green line Hurter and Driffield indices of refraction interference points investigation j j j Janicki latter lens lenses light Lummer plate Lummer-Gehrcke plate Lunelund measurements are given mercury lines metal Michelson Grating micrometer Nagaoka and Takamine nearly necessary normal exposure normal region number of ghosts orders of spectra parabola photographic plate photometry Phys placed present experiments principal line prism quartz reference line relative intensities relative position resolving power Satellite dX observed shows spectrum lines Stansfield structure of mercury thermopile thickness values of h