Alvan Graham Clark

Alvan Graham Clark (b. July 10, 1832, Fall River, Mass.—d. June 9, 1897, Cambridge, Mass.), joined his father and brother in the business in the early 1850s. Recognition of the family’s superb lenses was slow to come. The discovery of two double stars by the…

…and constructed by the optician Alvan Clark, while the mount was built by the firm of Warner & Swasey.

…first seen in 1862 by Alvan Clark, an American astronomer and telescope maker.