22 



TREES IN WINTER 



ably in accuracy with the expensive Faustmann hypsometer of 

 which it is a modification. A rectangular board about a foot in 

 length is ruled in squares or more conveniently has squared co- 



Fig*. 12. Home-made Height Measurer. 



ordinate paper pasted on one side (fig, 12). Care should be 

 observed that the top of the board AF is straight and accurately 

 parallel to the lines running lengthwise of the paper. The line 

 MC is numbered from M in any convenient unit, say up to 100, 

 and using the same unit, the line HK is numbered in both direc- 

 tions beginning at C. A thread with a weight is attached at M 

 and* hangs free from the zero point at the top of MC. In use a 

 convenient distance, say 100 ft. from the tree, is first measured off 

 as a base line, and upon this measurement largely depends 

 the accuracy of the height estimation. At the 100 ft. mark the 



