Alvan Clark & Sons

File:Lick Telescope 1889.jpg

Alvan Clark & Sons made the objective lens for the Lick Observatory refractor, shown here in an 1889 drawing. The telescope was designed and built by the Warner & Swasey Company

Alvan Clark & Sons was an American maker of optics that became famous for crafting lenses for some of the largest refracting telescopes of the 19th and early 20th centuries. Founded in 1846 in Cambridgeport, Massachusetts, by Alvan Clark (1804–1887, a descendant of Cape Cod whalers who started as a portrait painter), and his sons George Bassett Clark (1827–1891) and Alvan Graham Clark (1832–1897). Five times, the firm built the largest refracting telescopes in the world. The Clark firm gained "worldwide fame and distribution", wrote one author on astronomy in 1899.

File:Alvan Clark and his two sons ca1870s by TR Burnham Boston.png

Portrait of Clark and sons, circa 1870s (photo by T.R. Burnham)

The Dearborn telescope (housed successively at the University of Chicago, Northwestern University and Adler Planetarium) was commissioned in 1856 by the University of Mississippi. The outbreak of the Civil War prevented them from ever taking ownership. As a result, it was being tested in Cambridgeport when Alvan Graham observed Sirius B in 1862.

In 1873 they built the objective lens for the refractor at the United States Naval Observatory. In 1883, they build the telescope for the Pulkovo Observatory in Russia, the objective for the refractor at Lick Observatory was made in 1887, and the lens for the Yerkes Observatory refractor, in 1897, only ever exceeded in size by the lens made for Great Paris Exhibition Telescope of 1900.

The company also built a number of smaller instruments, which are still highly prized among collectors and amateur astronomers.

The company's assets were acquired by the Sprague-Hathaway Manufacturing Company in 1933, but continued to operate under the Clark name. In 1936, Sprague-Hathaway moved the Clark shop to a new location in West Somerville, Massachusetts, where manufacturing continued in association with the Perkin-Elmer Corporation, another maker of precision instruments. Most of Clark's equipment was disposed of as scrap during World War II, and Sprague-Hathaway itself was liquidated in 1958.

• Alvan Clark & Sons Telescopes
• 4" telescope at Rockford University, 2021.
  4" telescope at Rockford University, 2021.
• 8" telescope at Chabot Space and Science Center
  8" telescope at Chabot Space and Science Center
• 24" telescope at Lowell Observatory
  24" telescope at Lowell Observatory
• 26" telescope at United States Naval Observatory
  26" telescope at United States Naval Observatory
• 40" telescope at Yerkes Observatory, 1897
  40" telescope at Yerkes Observatory, 1897
• 40" telescope at Yerkes Observatory, 2006
  40" telescope at Yerkes Observatory, 2006
• The 9-inch Clark Refractor at Harvard Observatory, 2015
  The 9-inch Clark Refractor at Harvard Observatory, 2015
• The 7.5-inch Clark telescope dome at Harvard, in 2016
  The 7.5-inch Clark telescope dome at Harvard, in 2016
• 12" telescope at Jewett Observatory at Washington State University, 2024
  12" telescope at Jewett Observatory at Washington State University, 2024

See also

• Chabot Space & Science Center, Oakland, California
• Charles Sumner Tainter

References

• Deborah Jean Warner and Robert B. Ariail, Alvan Clark & Sons, artists in optics (2nd English ed.) Richmond, VA. : Willmann-Bell, in association with National Museum of American History, Smithsonian Institution, 1995 (1996 printing), 298 p. Template:ISBN
• Timothy Ferris, Seeing in the Dark Simon & Schuster 2002; 117p. Template:ISBN