The aberration formulas derived in paper II are checked against the well-knovn behavior of the Wadsworth and Eagle Mountings. A quantitative analysis of the Czerny-Turner arrangement of two mirrors and the Ebert-Fastie spectrograph is given. The compensation of the residual astigmatism for the Czerny-Turner arrangement is treated. It is found that a plane grating produces coma and astigmatism in a homocentric, converging light bundle.
GOTTFRIED R. ROSENDAHL, "Contributions to the Optics of Mirror Systems and Gratings with Oblique Incidence. III. Some Applications," J. Opt. Soc. Am. 52, 412-415 (1962)