

5^C 



DEEPER WATER 

 02 



= 0.1 



DIRECTION OF 

 LEVEL BOTTOM 



SHALLOWER WATER 



Use of scale. The arm of a drafting ne chine is set 

 parallel to tbe orthogonal direction. The protractor 

 is placed in the direction of level bottom, with its mid- 

 point at the point of turning. The intersection of the 

 perpendicular from this point to the drafting machine arm 

 •with the appropriate ^^,^ line gives the correct Aac 

 This angle is tton turned on the drafting machine, and 

 the orthogonal continued in its new direction. 



FIGURE 4 



