National Geographic : 1942 May
676 The National Geographic Magazine These Pictures Tell the Story of a Map, from Mind to Magazine First stage in making a map is computing and drawing a grid of lines to represent latitude and longitude. The cartographer uses a set of celluloid curves, each of different radius, to draw the map skeleton. Staff Photographer It. Anthony Stewart Data from Danish Explorers Make Greenland's Icy Image More Nearly Complete Here a measurement is being made with the upper points of the scissorslike proportional dividers. Auto matically the points at their opposite end indicate the same distance on the reduced scale.