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

Alvan Graham Clark

Alvan Graham Clark (1832 – 1897), born in Fall River, Massachusetts, was an American astronomer and telescope-maker. He was the son of Alvan Clark. In 1862, while testing a new 18-inch refracting telescope he discovered Sirius B, the magnitude 8 companion of Sirius.

Reference

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

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