A Plan of the Erewash Canal, part of the Cromford canal and a proposed Canal from Langley Bridge to eh Trent near Nottingham ; shewing the relative situation they bear to each other and to the River Trent [and] A plan of a new Intended Canal From the Mouth of the Derwent River and the Grand Trunk Canal, cross the Ereswash Canal and Erewash River sjirting the lower parts of Nottingham and terminating below all the Shoals next adjoining, to, and below Trent Bridge [Mapa]
Summary
Escala gráfica de 4 millas [= 10 cm]. Orientado con lis en ros de ocho vientos
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.
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