To meet a number of spectrochemical problems involving relatively complex spectra, a versatile grating spectrometer having high resolution and dispersion and using photomultiplier tubes to measure the intensities of the spectral lines was constructed. A concave diffraction grating having a radius of curvature of 21 feet 10 inches and ruled with 15,000 lines per inch over a 5 inch surface was used in an Eagle mounting designed to cover continuously the range from 2000 Ã…ngstrom Units in the first order to 5800 Ã…ngstrom Units in the fourth order. Five feet of spectrum are available at any setting of the instrument. To minimize backlash and spurious motion, kinematic principles were used in the design of the adjustments. Vibration absorbers and dampeners were used to minimize the effects of vibration, and constructing the instrument in a completely enclosed room located within an air-conditioned area minimized the effects of temperature changes. Either visual or photographic means may be used to position the exit slits and to adjust the optics. Both scanning and integration techniques are available.

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