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Frank McClean FRS was a British astronomer and pioneer of objective prism spectrography.
His father was the engineer J. R. McClean, FRS. Graduating from Trinity College, Cambridge in 1859, Frank McClean was a Bachelor Scholar at Trinity for the next three years. As an engineering apprentice to Sir John Hawkshaw from 1859 to 1862, he participated in improvements in the drainage of the Fens Districts. In 1862 he became a partner in the firm of Messrs. McClean and Stileman, eventually retiring in 1870 to work on astronomy and live at Tunbridge Wells, at Ferncliffe with his wife and children.
He did important spectrographic work in astronomy, inventing his well-known star-spectroscope in 1875 and observing solar prominences. In 1877 he moved to Rusthall House, Tunbridge Wells, fitted his polar heliostat to the roof of his house, and with a grating spectroscope and electrical equipment began his studies of the solar and metallic spectra. McClean built an observatory and carried out a survey of the brighter stars in the northern hemisphere. After two years' work he finished the northern sky. In the spring of 1897 he went to the Cape of Good Hope to survey the southern stars. In six months he had made photographs of 116 stars in the southern hemisphere. in 1897 he discovered the presence of oxygen in spectrographs from Beta Scorpii, Beta Canis Majoris, Beta Centauri, and Beta Crucis. His spectrographic survey of the stars was cited in the presentation to him of the Gold Medal of the Royal Astronomical Society in 1899.
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