Eagle Mounting

The Rowland and Paschen mountings have largely been replaced by Eagle mounting illustrated in fig. In this mounting, that portion of the spectrum which is diffracted back at an angle almost equal to the angle of incidence, is focused on the plate P. to study the different regions of the spectrum the grating is turned about an axis perpendicular to the plane of the paper. Correspondingly the plate holder P, which is hinged on one side of S is turned such that P and S lie on the Rowland circle. For studying spectra in the ultra-violet region, the Eagle mounting is commonly used in vacuum spectrographs.

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