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At Boyden Observatory near Bloemfontein, there is a 20-cm coelostat with instrumentation for making narrow-band Ha observations.
Caption: SUN SPOTTING The Snow horizontal telescope (coelostat) was a gift to Yerkes Observatory from Helen E.
Between 1890 and 1903 Common made several attempts to convert the five-foot to a Cassegrain with inconclusive results, built a coelostat which Turner took to eclipses in Japan (1896) and India (1898), and joined the RAS/BAA expedition to the Norway solar eclipse.
A coelostat is an instrument used in which branch of science?