. The woodsman's handbook. e top of the tree. The plumb line is allowed full play andcrosses the left-hand horizontal scale. As soon as the plumb lineis at rest the number which it crosses is read off in the number indicates the height of the tree from the level of theobservers eye to its top. He then sights through the instrumentto the base of the tree and reads the number crossed by the plumb INSTRUMENTS TSEFUL TO A WOODSMAN. 101 line on the right-hand horizontal scale. This number indicatesthe distance from the level of the observers eye to the base of thetree, and is added to t
. The woodsman's handbook. e top of the tree. The plumb line is allowed full play andcrosses the left-hand horizontal scale. As soon as the plumb lineis at rest the number which it crosses is read off in the number indicates the height of the tree from the level of theobservers eye to its top. He then sights through the instrumentto the base of the tree and reads the number crossed by the plumb INSTRUMENTS TSEFUL TO A WOODSMAN. 101 line on the right-hand horizontal scale. This number indicatesthe distance from the level of the observers eye to the base of thetree, and is added to the number before secured, which gives thetotal height of the tree. If the observer should be standing sothat the level of his eye is below the base of the tree, he shouldfirst determine the height from the level of his eye to the top ofthe tree, then the height from the level of his eye to the base ofthe tree, and subtract the last result from the first, which givesthe true height of the tree. Cost about $10. (See fig. 9.). Fig. 9.—Manner of using Faustmanns height measure. A cheaper form of this instrument has a wooden frame and slide,and scales printed upon strips of paper pasted upon the frame. Forest Service Standard Hypsometer. For use on the National Forests, and in its investigative workelsewhere, the Forest Service has adopted a standard following instructions for its use have been issued :fl Stand 100 feet from the base of the tree which is to be measured. o From Instructions for Making Forest Surveys and Maps, unnumbered1^ circular of the Forest Service, United States Department of Agriculture. 102 THE AVOODSMAN S HANDBOOK. The observer inserts the fingers of his left hand into the loop ofleather straps attached to the back of the hypsometer, with both
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