686 



Journal of Agriculture. [jo Nov., 1910. 



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12. DIAGRAM OF CHESSBOARD SURVEY. 



base or fence. If it does not, make it do so by shifting C. With sight 

 sticks at A and C the line may be projected indefinitely. In place of 



13. SETTING OUT A SQUARE. 



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14. USING AN OPTICAL 

 SQUARE. 



3, 4, and 5 a better result will be achieved by using 30, 40, and 50, 60.. 

 80, and 100, or other multiples, the sight sticks then being further apart- 

 insuring greater accuracy. 



