The Alvan Clark reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Alvan Clark

Alvan Clark (1804 – 1887), born in Ashfield, Massachusetts, was an American astronomer and telescope maker. Using glass blanks made by Mantois of Paris his firm, Alvan Clark & Sons, ground lenses for refracting telescopes, including the largest refracting telescope in the world, the 40-inch at Yerkes Observatory, and the second largest, the 36-inch telescope at Lick Observatory. One of Clark's sons, Alvan Graham Clark, discovered the dim companion of Sirius.

Reference

• http://reference.allrefer.com/encyclopedia/C/Clark-Al.html

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