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![The NW section of the chart of Boston Harbor, Mass cgs05379.jpg The NW section of the chart of Boston Harbor, Mass](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_cgs05379.jpg?itok=rhoMz6fD)
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The NW section of the chart of Boston Harbor, Mass. Showing note onTriangulation was executed in 1846&47. Topography & Hydrography were done in1846, 60&64. Symbols of Sunk Rock, Rock Awash, Ledge of Rocks, Positionof Life Boat, and Hut of Refuge. Humane Society established Hut of Refuge. (Image credit: NARA C&GS; Colllection)