Measurements on the index of refraction of air for wave lengths from 2218 A to 9000 S
A 1919 technical paper from the National Bureau of Standards reporting measurements of the refractive index of air across ultraviolet to infrared wavelengths, written for physicists and metrologists. The line engravings show optical benches, mirror and prism light paths traced as thin rays, and sectioned apparatus in hatched cutaway, useful for diagrammatic ray schematics and cross-section shading patterns.



