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 
| BC is measured and his own height from his feet to his eyes AB. 
Eten: AB: BCHAD: DE. DE=LCXAY. 
=. —en- 2x 60 
acai Let AB=6; BC=5; AD=60; then §  =50, height 
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 [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 
