U.S. Coast and Geodetic Survey, Jones, Ernest Lester, 1876-1929 · Washington : Govt. Print. Off. · leaf 74
Fig. 24.—SOUNDING BY HAND FROM A SHIP IN COMPARATIVELY SHALLOW WATER. Special Publication No. 38. … Fig. 25.—SOUNDING FROM A SHIP IN FAIRLY DEEP WATER, USING A HEAVY LEADAND A HOISTING MACHINE. Special Publication No. 38.
Charts, diagrams, etc
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
