768 JOURNAI. OF FORESTRY 



timber, one traverse going through the left edge and one through the 

 right edge of this fringe. The heights and positions of the tallest trees 

 along the lines of these levels were determined. These heights can 

 be easily determined by measuring 100 feet from the base of the tree, 

 on level ground, and sighting at the top of the tree with the hand-level, 

 the height being expressed in feet by the reading in per cent. To this 

 is added the height of the instrument above the ground. 



These levels and the heights and positions of the trees were then 

 accurately platted on cross-section paper ; and a straight line, repre- 

 senting the line of sight, drawn through the tops of the trees as shown 

 in figure 1. The vertical distance from any point on the ground to 

 this line of sight is the necessary height of the lookoutman's eye in 

 order to see over the tree-tops. This calculation shows that this 

 height, at the summit of the peak, is 08 feet and down near the timber 

 it is 65 feet. A tower near the timber would permit looking over the 

 peak and down the opposite side, and the timber would give the tower 

 shelter from the wind. 



It still remains to be seen, by actually building the tower, whether 

 this is the correct height, but there seems at least to be no fault in the 

 method, if accurately applied. 



