Tracing from the Reconnaisance of the Western Coast (Southern Sheet), showing lines of soundings to determine the 500 fathom curve

Tracing from the Reconnaisance of the Western Coast (Southern Sheet), showing lines of soundings to determine the 500 fathom curve. Run by the Hydrographic party on board the U.S.C.S Stmt Hassler, under the command of Comdr P.C. Johnson U.S.N. Assist C.S.

Photo Category: Coast and Geodetic Survey - Archive
Photo Location: California
Photo Date: 1874