Sears Cook Walker [photograph], [ca. 1850-1853].

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Sears Cook Walker [photograph], [ca. 1850-1853].

http://www.worldcat.org/oclc/51245324

Half-plate daguerreotype in leather case of the mathematician and astronomer Sears Cook Walker (1805-1853). The photograph was taken by an unknown photographer ca. 1850-1853.

1 photograph : daguerreotype, b&w ; visible image 12 x 8 1/2 cm. (half-plate), in case 15 x 12 cm.

Massachusetts Historical Society

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SNAC Resource ID: 7636765

Massachusetts Historical Society

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Walker, Sears Cook, 1805-1853

http://n2t.net/ark:/99166/w6hx254d (person)

American astronomer who taught at Harvard, was an actuary for the Pennsylvania Company for the Insurance on Lives and Granting Annuities, served as an assistant at the United States Naval Observatory, and finally headed the Longitude Department of the United States Coast Survey. During his tenure at the U.S. Coast Survey, he developed the method of determining differences of longitude by telegraph. From the description of A commonplace book upon the plan recommended and practised by ...