Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 356
38 SPECTROSCOPY very tedious process, and hence Fabry and Perot,^ profitingby their experience with their interferometer, have adoptedfixed air layers as interference apparatus, the widths of whichare determined once and for all. They call these apparatusstandards {ktalons), and have made use of… … Fig. 133. These standards consist of two half-silvered glass plates, asbefore, which are kept apart by polished steel supports. Theplates are kept pressed against the supports by binding screws,by means of which they are very carefully adjusted and madeparallel. The apparatus is shown in Fig. 133.…
Spectrum analysis
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