The world according to Mercator's projection or Edw Wright's

Single sheet, hand coloured engraving. Mercator projection. Two sets of diagrams above the map illustrate: Plain sailing in its most usual cases, and The usual cases of Wright's sailing.
From an unidentified navigation manual (perhaps by Patoun) Plate 3, Page 48. It illustrates the trigonometry needed to use a Mercator seachart.

Object Details

ID: G201:1/34
Collection: Charts and maps
Type: Chart
Display location: Not on display
Creator: Anonymous
Places: World
Date made: circa 1730
Credit: National Maritime Museum, Greenwich, London
Measurements: Printed area 19.5 x 29.5cm, on sheet 20.5 x 32.5cm.
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