136 THE WOODSMAN S HANDBOOK. 
Another method sometimes used is as follows: The observer 
walks on level ground to a distance from the foot of the tree about 
equal to its estimated height. He then lies on his back, stretched 
at full length (fig. 8), and an assistant notes on a perpendicular 
staff erected at his feet, the exact point where his line of vision 




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Fic, 7.—Measuring the height of a tree by means of two poles. 
to the top of the tree crosses the staff. The height of this point 
from the ground BCis measured and his own height from his feet 
BCX AD 
to hiseyes AB. Then: AB: BC=AD: DE. DE=——*= “ 
rae 8. 
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Example: Let AB=6; BC=5; AD=60; then tas =50, height 
of tree. 

