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e command of the Khalif Al Maimoun, between 813 and 833 A. D.
Charts were introduced into the marine service by Henry, son of John I. of Portugal, about A. D. 1400; brought to England by Bartholomew Colon in 1489.
Mercator's chart is a projection of the surface of the earth in the plane, with the meridians parallel to each other, the degrees of longitude all equal, and the degrees of latitude increasing in a corresponding ratio towards the poles.
It was introduced by Gerald Mercator in 1556.
The principle of its construction had, however, been previously explained by Edward Wright.
The first computation of longitude from the meridian of Greenwich Observatory was in 1679.
The first magnetic chart was constructed by Dr. Halley, in 1701.
It was limited to the Atlantic and Indian Oceans.
An instrument for measuring maps and charts.
1. (Printing.) A rectangular iron frame (a, Fig. 1255) which receives the matter from a galley, and in whi