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es which led to the construction of the great Washington telescope, we find it to commence with so small a matter as the accidental breaking of a dinner-bell, in the year 1843, at the Phillips Academy, Andover, Mass. One of the students, George B. Clark by name, gathered up the fragments of the bell, took them to his home in Cambridgeport, melted them, and cast them into a disk. His father, Alvan Clark, assisted him, and the combined skill of father and son produced a five-inch reflecting ng them by the method of local correction. His first work in telescope making was done in his home on Prospect Street, opposite the Tilton House. The firm moved to the present location at about 1860. Alvan Clark died in August, 1887, and George B. Clark in December, 1891. The business is now carried on by the remaining son, Alvan G. Clark. In 1862 Alvan G. Clark, by the aid of a newly constructed glass, discovered the companion to Sirius, and for this discovery he was awarded the Leland