MEASUREMENT OP STANDING TREES. 

 HEIGHT MEASURING. 



There are various methods emx^loyed in determining the height of a 

 standing tree; of these the geometrical method may be recommended 

 for its simplicity and sufficient accuracy. At some distance from the 

 tree (fig. 1), where both top and base are readily visible, place a pole from 

 4 to 5 feet long (SF) j)erpendicularly in the ground; put in the ground 

 another and longer pole (DE) at some distance from the first one, so 

 that the poles and tree are situated in the same vertical plane. 



Flo. 1. — Measuring the height of a tree by means of two poles. 



Sight from the top of the smaller pole the base and the top of the tree 

 and note the points where your lines of vision intersect the longer pole; 

 measure the distance between them ; measure also the horizontal dis- 

 tance between the small pole and the tree and that between the two 

 poles. Multiply the first distance by the second and divide by the 



third, the result being the height of the tree ( ^^-^ j. 



Example: Let the distance between the points where the lines of 

 vision intersect be G feet, the distance between the pole and tree 30 



