INSTRUMENTS USEFUL TO A WOODSMAN. 99 



at his feet, the exact point where his line of vision to the top of 

 the tree crosses the staff. The height of this point from the ground 

 EC is measured and his own height from his feet to his eyes AB. 



Then: AB: BC=AD: DE. DE= BC * D . 



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Example: Let AB=6', C=5; AD=QO] then 5X60 ==50 height 

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of tree. 



Faustmann's Height Measure. 



This instrument, shown in figure 8, consists of a skeleton rectan- 

 gular metal frame having two crossbars at one side of its longi- 



FIG. 8. Faustmann's height measure. 



tudinal center, the frame and bars being in one piece. A slide, 

 reversible end for end and having beveled edges, works in under- 

 cut grooves formed in the inner edges of the crossbars. This slide 

 is provided at its ends with thumb notches, and with transversely 

 arranged index marks, designated I and II. A plumb line carrying 

 a plummet is attached to the slide in the center of the index 

 mark II. A retaining spring secured to the back of the frame and 

 bearing against the inner face of the slide holds it in any position 



