118 



MAPPING 



line CC', as well as those on the lines A A', BB', 1 , 2, etc. The 

 points having the same elevation are then joined by con- 

 tinuous lines, forming the contour lines. 



The upper part of the figure shows a vertical section, or a 

 profile, on the line CC' of the contour map. The horizontal 

 lines 0-0, 6-5, etc. correspond to the elevations of the 

 contour lines. The points c, b, c, d, etc. are projected on the 

 lines of corresponding elevations on the profile, giving the 

 points a', b f , c f , etc. These points are then joined by a 

 continuous line representing the surface of the ground along 

 the line CC. 



MAPPING 



Conventional Signs. Fig. 1 shows the manner of represent- 

 ing the shore line of a body of water. Fig. 2 shows a rocky 

 and abrupt shore, the irregular dotted surfaces surrounded 

 by shore lines representing sandbars and the dotted outlines 

 beyond the shore line shoals or submerged rocks. Fig. 3 



FIG. 1 



shows how to represent a sandy shore, the irregular dotted 

 surfaces inland from the shore line representing sand dunes. 

 Fig. 4 shows the manner of representing the shore lines of 

 rivers; for small brooks and creeks, one line is used. Fig. 5 

 shows the manner of representing grass; Fig. 6, cultivated 

 land; Fig. 7, orchard; Figs. 8 and 9, woods; Fig. 10, clearings; 



