United States Coast Survey No. 41 Alidade, first quarter 20th century, lacquered brass high-post alidade with a 15-in. scope, vertical arc calibrated 30-0-30 with vernier, circular spirit level mounted to the 22-in. plate marked "U.S.C.S. No. 41," housed in its original fitted box with stenciling. Note: The agency began in 1807 as the Coast Survey and became the Coast and Geodetic Survey around 1878. Provenance: Richard Miller Collection. Estimate $300-500 Items may have wear and tear, imperfections, or the effects of aging. Any condition statement given, as a courtesy to a client, is only an opinion and should not be treated as a statement of fact. Skinner shall have no responsibility for any error or omission.