108 THE WOODSMAN’S HANDBOOK. 
structed so that when pressure is applied to its inner edge, as when 
it is brought against a tree trunk, it swings into a position in which 
it is at a true right angle to the beam. 
For use in eastern forests the most convenient caliper is one 
having a beam measuring 36 inches and arms half that length. 
Cost; $4. In forests where trees over 3 feet in diameter occur 
a caliper having a beam measuring 50 inches and proportionately 
long arms should be used. 
| 
; 
i Fig. 13.—Cruiser’s tree counter. 
| Care should be taken to secure calipers made of perfectly sea- 
soned wood, for otherwise they will warp. Calipers graduated to 
show the contents of logs in board feet or cords are being intro- 
duced in many sections of the country. 
DIAMETER TAPE. 
This is a tape for ascertaining the diameter of very large trees, 
such as the redwoods of the Pacific coast. It is furnished with 
special graduations, so that when the girth of a tree has been 
measured its diameter is read directly from the tape. No cut of 
this tape is shown. | 
