"Alvan Clark"@en . "1804Z"^^ . . . "Alvan Clark (March 8, 1804 \u2013 August 19, 1887), born in Ashfield, Massachusetts, the descendant of a Cape Cod whaling family of English ancestry, was an American astronomer and telescope maker. He was a portrait painter and engraver (ca.1830s-1850s), and at the age of 40 became involved in telescope making."@en . "Clark, Alvan"@en . "1887Z"^^ . "American astronomer" . . . "1804-03-08Z"^^ . "1887-08-19Z"^^ . .