Alvan clark biography of george michael
Alvan clark biography of george michael wikipedia
George harrison age at death!
Clark, Alvan
(b. Ashfield, Massachusetts, 8 March 1804; d. Cambridgeport, Massachusetts, 19 August 1887); CLARK ALVAN GRAHAM (b. Fall River Massachusetts, 10 July 1832; d.
Cambridgeport, Massachusetts, 9 June 1897); CLARK GEORGE BASSETT (b. Lowell, Massachusetts, 14 February 1827; d.
Alvan clark biography of george michael
Cambridgeport, Massachusetts, 20 December 1891),
astronomical instrumentation
Three instument markes—Alvan Clark and his sons, George Bassett and Alvan Graham—figured importantly in the great expansion of astronomical facilities that occurred during the second half of the nineteenth century.
Almost every American observatory built during this period, and some observatories abroad, housed an equatorial refracting telescope and often auxiliary apparatus as well, made by the Clarks. Five times the Clarks made the objectives for the largest refracting telescope in the world; and the fifth of their efforts, the forty-inch lens at the Yerkes Observatory, has never been surpassed.
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