Descriptions are given of Fabry-Perot spectrometer systems used in the total eclipses of 1965, 1966, and 1970 to observe the emission lines 5303 Å, Fe XIV and 6374 Å, Fe x at different points in the solar corona. Some results of coronal temperature measurements for the 12 November 1966 eclipse are presented.
G. Henderson, "Interferometry of the E Corona," Appl. Opt. 9, 2635-2642 (1970)