The international geography . the featuresof the ground was first supplied by Philip Buache in 1737, when he placedbefore the French Academy a map of the Channel, on which the configura-tion of the sea-bed was indicated by contour lines, i.e., lines which run ^ Instructive examples of early attempts at hill sketching are the wonderful mapsdrawn by Leonardo da Vinci (1452-1519), K. Tiirsts Landtafel of Switzerland (1495),Apians map of Bavaria (1568), and G3gers map of the Canton of Zurich (1667). 32 The International Geography through all points at the same level, Uke the line of contact of sea

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The international geography . the featuresof the ground was first supplied by Philip Buache in 1737, when he placedbefore the French Academy a map of the Channel, on which the configura-tion of the sea-bed was indicated by contour lines, i.e., lines which run ^ Instructive examples of early attempts at hill sketching are the wonderful mapsdrawn by Leonardo da Vinci (1452-1519), K. Tiirsts Landtafel of Switzerland (1495),Apians map of Bavaria (1568), and G3gers map of the Canton of Zurich (1667). 32 The International Geography through all points at the same level, Uke the line of contact of sea Stock Photo
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The international geography . the featuresof the ground was first supplied by Philip Buache in 1737, when he placedbefore the French Academy a map of the Channel, on which the configura-tion of the sea-bed was indicated by contour lines, i.e., lines which run ^ Instructive examples of early attempts at hill sketching are the wonderful mapsdrawn by Leonardo da Vinci (1452-1519), K. Tiirsts Landtafel of Switzerland (1495),Apians map of Bavaria (1568), and G3gers map of the Canton of Zurich (1667). 32 The International Geography through all points at the same level, Uke the line of contact of sea
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The international geography . the featuresof the ground was first supplied by Philip Buache in 1737, when he placedbefore the French Academy a map of the Channel, on which the configura-tion of the sea-bed was indicated by contour lines, i.e., lines which run ^ Instructive examples of early attempts at hill sketching are the wonderful mapsdrawn by Leonardo da Vinci (1452-1519), K. Tiirsts Landtafel of Switzerland (1495),Apians map of Bavaria (1568), and G3gers map of the Canton of Zurich (1667). 32 The International Geography through all points at the same level, Uke the line of contact of sea and landin calm weather. He suggested that this method might advantageously beextended to the delineation of the land, and this was done for the first timein 1791, when Dupain-Triel published a contoured map of France. Ascientific framework or skeleton for delineating the ground had thus beenfurnished ; the contour lines drawn at equal intervals sufficing, if numerous Scale rm.-lmile(l63360]Cotitours at inUrvala of 25 feet.. Fig. 16.—The Guildford Gap : Contoured Map. enough, not only to show the actual height of the land but the form andgradient. Crowded contour-lines indicate a steep slope, contour-lines farapart a gentle slope. Something more than contour-lines was needed to give plasticity tomaps. Various methods have been introduced for effecting this purpose.By increasing the number of contours the shape of the hills can be