Charts. Wenchow Port and approaches, Ou River, China, original British surveys in 1843 and 1878, survey by U. S. S. Wilmington in Oct. 1907, scale naut, m.=1 in.; with inset, Wenchow Anchorage, from survey by Alfred Walker in Dec. 1906, scale 1000 yds.=2.93 in.; chart 2546. 1st edition.