HEIGHTS 0F» STANDING TREES 5 



Note. — The various rough methods are described below: 

 Sfiadoiv Method 

 (a) Stick a pole of any convenient length, upright in the ground and measure 



its heiglit above the ground. 

 (6) Measure the shadow oi the pole and the shadow of the tree and by 

 proportion compute the height of the tree. 



Two-Pole Method 



(o) Stick a pole about 4 feet long, upright in the ground at any convenient 



distance from the tree. 

 (6) About 6 feet away from this pole and in line with the first pole and the 



tree place a second pole about 10 feet high. 



(c) Sight from top of the short pole and make marks on the long pole at the 



intersections of the lines of sight to the top and to the base of the 

 tree. 



(d) Measure the length between these marks, the distance from the top of 



the short pole to the base of the tree and the distance from the top 

 of the short pole to the lower mark on the long pole. 



(e) By proportion compute the height of the tree. 



Prostrate Method. 

 This method is similar to the two-pole method, except that the short pole 

 is dispensed with and the observer takes the sight by lying on his back on 

 the ground with his foot against the long pole. 



Sinch-Poh Method 



(a) Hold a pole about 5 feet long at arm's length loosely between the fingers 

 of one hand, so that it will swing into an upright position and so 

 that the portion of the pole above the hand is equal in length to the 

 distance of the hand from the eye. 



(6) Without changing the position of the hand with reference to the eye, 

 step slowly forward or backward until the line of sight to the bas ,■ 

 of the tree strikes across the hand, and the line of sight to the top 

 of the tree just. includes the tip of the pole. 



(e) The height of the tree then equals the distance of the observer from 

 the tree. 



3. After using the rough methods, use the different hypsometers. 



4. Tally all measurements, on Form 1, according to the following form of 

 notes: 



Instrument Total Error from Remarks 



or m.ethod Height Standard 



Two pole 83 1 



Faustman. . . 84 



The third column will be used for entering the error of each instru- 

 ment or method from the height as measured by the transit or other 

 accurate method. The ''Remarks" column will be used for enter- 

 ing the estimator's reasons for condemning or recommending the 

 instrument or method. 



