Depths shown by soundings.
Manuscript chart of Sandy Bay (Rockport), Massachusetts.
"The soundings, which are noted in feet and inches are reduced to the lowest tides registered in eight days..."
"Copy of report of Capt. Bache accompanying this place dated April 1st 1830, is on file in U.S. Engr. Office, Boston, Msss. H. of R. at Sandy Bay, #12, 1883."