Map of Portland Harbor. Maine Surveyed under the direction of Lt. Col. John Anderson, U.S. Top. Engineer. Drawn by Lieut. B. Poole, 3d Artillery 1833

Collection: Osher Collection

Name: Map of Portland Harbor. Maine Surveyed under the direction of Lt. Col. John Anderson, U.S. Top. Engineer. Drawn by Lieut. B. Poole, 3d Artillery 1833

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Notes: Note: "Engraved by J.V. N. Throop, D.C." From: Report of the survey of Stanford's Ledge, Portland Harbor, Maine, 1832, Congressional Series 259 (23rd Congress, 1st Session) House Document Includes islands, points, coves and other landmarks: Foul Ground; Simonton Cove; Stoney Point; Fort Preble; Black Buoy; Cumming's Point; Stanford's Ledge; Red Buoy; Cumberland and Oxford Canal; Middle Ground; Mount Joy; Back Cove; Presumpscot River; Hog Island Ledge; Little Hog Island; Great Hog Island; House Island; Peakes Island; Banges Island.

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Dimensions: 46 x 51 cm.

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Historical Context: By 1833 sufficient soundings taken in Portland harbor enabled the cartographer of this large-scale chart to create a topographic map of the sea bottom. Isobars--lines connecting equal depth-- give the navigator a comprehensive description of what he will encounter on all routes and points of sailing. As a further aid, the position of buoys are shown, to warn the navigator of danger. Depths are indicated in fathoms at low water. Strong winds, however, can augment or diminish these soundings. A graphic depiction of the effect of wind on the tide is shown in the lower left corner of the chart.

LC Call Number: TC203 .P55 .P8 1833

OCLC: 55520526

Accession Number: OS-1833-5

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