Two Thomas Whitney Surveyor's Compasses, Philadelphia, Pennsylvania, 19th century, a large vernier compass with 7-in. dia. silvered dial marked "Thos. Whitney/maker/Philadelphia/No. 559, Warranted," with outkeeper and dual levels; and a 6-in. dia. example; both with their original wood box. Provenance: Robert Miller Collection. Estimate $300-400 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.