Collection: Osher Sheet Map Collection
Title: 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
Creator: Pool, B.*
Surveyor: Anderson, John*
Publishing Location: Washington D.C.
Date Produced: 1833
Date Published: 1833
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.
Map Type: Nautical charts
Dimensions: 46 x 51 cm.
Printing Process: Engraving
Printing Technique: Copper
Material Type: Paper
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.
Brief Description: Chart of Portland Harbor showing soundings and islands. The chart includes a tide table.
Physical Description: 1 chart: illustrated
Permanent URL: https://oshermaps.org/map/983.0001