
INSTRUMENTS USEFUL TO A WOODSMAN. 141 
push button. A spring secured to the back of the panel engages 
with the button and draws the head of the screw against the eve 
of the rod, and so holds the pendulum against swinging, except 
when the button is pushed inward to take the tension of the spring 
off the pendulum, which is then free to swing by gravity when 
the instrument is held in avertical plane. The disk of the clinom- 
eter, shown in the figure, also has some directions engraved upon 


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Fic, 11.—Clinometer for measuring heights. 
it. The instrument is only about 3 inches square and may be 
easily carried in the vest pocket. 
To use the instrument the observer sights along its upper edge 
to the top of the tree and releases the pendulum by pressing the 
push button. When the pendulum comes to rest over the right- 
hand scale, the pressure on the push button is removed, permit- 
-ting the spring to act to hold the pendulum until the reading 

