78 INSTRUCTIONS FOR MAKING FOREST SURVEYS, ETC. 



METHOD OF USING THE FOREST SERVICE STANDARD 

 PLANIMETER. 



Planimeters are issued to some forest officers and are 

 used to determine areas platted on maps. They are 

 constructed to register areas in square inches and deci- 



. 12. Standard planimeter. 



mals of 1 square inch and are used in the following 



manner: 



(1) Place the weighted stationary pin, A, figure 12, 

 outside of the area to be determined, below and to the 

 left, in a position which will permit the " tracing pin/' 



