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. His other son was George Bassett Clark; both sons were partners in the firm.
Reference
- http://reference.allrefer.com/encyclopedia/C/Clark-Al.html
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