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[Shandong, Zhili, Shengjing hai jiang tu], Qingdao China

description

Summary

Scale ca. 1:125,000.
Title supplied.
Oriented with north to the left.
Relief shown pictorially.
Pictorial map.
Shows coastal defenses of Shandong, Hebei, and Liaoning Provinces.
Hummel gift 1962, no. 6.
Available also through the Library of Congress Web site as a raster image.
Prev. call#: G7822.C6R4 1700 .S4 Vault Shelf
AACR2

In the 17th century, maps took a huge leap forward. Mathematical and astronomical knowledge necessary to make accurate measurements had evolved. English mathematicians had perfected triangulation: navigation and surveying by right-angled triangles. Triangulation allowed navigators to set accurate courses and produced accurate land surveys. Seamen learned to correct their compasses for declination and had determined the existence of annual compass variation. Latitude determination was greatly improved with the John Davis quadrant. The measurement of distance sailed at sea was improved by another English invention, the common log. Longitudinal distance between Europe and Québec was determined by solar and lunar eclipses by the Jesuit Bressani in the 1640s and by Jean Deshayes in 1686. With accurate surveys in Europe, the grid of the modern map began to take shape.

date_range

Date

01/01/1634
person

Contributors

Hummel, Arthur W. (Arthur William), 1884-1975.
place

Location

create

Source

Library of Congress
copyright

Copyright info

Public Domain

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