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Title: Report of Professor John Locke, of Cincinnati, Ohio, on the Invention and Construction of His Electro-Chronograph for the National Observatory, in Pursuance of the Act of Congress, Approved March 3, 1849 ..
Imprint: Cincinnati: Printed by Wright, Ferris and Co., 1850.
Description: 2 p. l., xi, , 67 p. incl. diags. XVII fold. Pl. ; 21 cm.