U.S. Army Engineers
1878

Early U.S. Flow Map Tonnage Chart of Coastwise Commerce

Tonnage Chart of Coastwise Commerce North of San Francisco -California Including Arrivals and Departures 1878.

DESCRIPTION: Scarce thematic flow map of the United States west coast: California, Oregon, and Washington. An early institutional example of a "flow map" used for the U. S. Government. The flow map was first used less than 40 years earlier by Charles-Joseph Minard after his earlier formative use line width to display the attrition of French troops during Napoleon's Russian campaign of 1812.

The chart shows the volume (tonnage) of maritime trade from all points south of San Francisco to ports along the U.S. West Coast. The use for the chart was to support the decision-making process for selecting a new harbor of refuge and breakwater on the Pacific Ocean between the Strait of Juan de Fuca and San Francisco.

Tonnage Chart of Coastwise Commerce North of San Francisco -California

From "Harbor of Refuge on the Pacific Coast Appendix PP of the Annual report to the Chief of Engineers for 1881. Washington: Government Printing Office. 1881.

CREATOR: U.S. Army Engineers

PUBLICATION DATE: 1878

GEOGRAPHIC AREA: United States

BODY OF WATER: Pacific Ocean

CONDITION: Very good.  Clean, solid. Minor age toning.

COLORING: None

ENGRAVER: 

SIZE: 8 " x 15 "

ITEM PHYSICAL LOCATION: 3

PRICE: $320

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