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Alvan Clark ( March 8, 1804 – August 19, 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. His other son was George Bassett Clark; both sons were partners in the firm.

References

http://reference.allrefer.com/encyclopedia/C/Clark-Al.html
Alvan Clark & Sons, Artists in Optics, by Deborah Jean Warner and Robert B. Ariail, BooksEnthsiast.com

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Alvan Graham ClarkAlvan Graham Clark ( July 10, 1832 June 9, 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 magni	Alvan ClarkAlvan Clark ( March 8, 1804 August 19, 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	Alvan T. FullerAlvan Tufts Fuller ( February 27, 1878- April 30, 1958) was an American political figure, and Governor of Massachusetts from 1925 until 1929. Fuller was born on February 27, 1878 in Boston, Massachusetts. Educated in the public schools, he ran a bicycle r
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