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A.U. Iron arc A.U. line absorption spectrum actual resolving power adjustment amperes Angstroms Angstroms arc lamp blurred bulb camera end chronograph Computed Identified Wave corresponds to Plate Data which corresponds degree of constancy diaphragm diffraction pattern discontinuity entire grating exposed portion exposures Figure 14 film focal point focussed Foucault knife-edge test grating space green line hence image should darken IMPERFECT GRATING inch air space inch slit inner box investigated Iron Lines cm knife-edge is introduced larger good portion length for Iron line of Mercury mirror moveable slits Note Figure Note Plate o*clock the variation obtained photographic plate placed point source R. P. Johnson R. W. Wood Reading Wavelength length Reference line reflected light Region Rowland mounting ruled area ruling space second and third second order shape of groove shutters source of light spectral lines speculum metal temperature control thermometer thermostatic control third orders various portions whole grating