184 



FAEM FORESTRY 



The following form can be used for recording the data 

 for each log estimated. A separate form can be made out 

 for each species, or a column can be added to indicate the 

 species : 



Species. 



Diameter 

 of log. 



Condition of log. 

 Defects, crook, 

 etc. Amount to 

 deduct. 



Board-feet in log after 

 allowing for defects. 



At the same time the logs are being recorded in each tree, 

 the estimator, if it is desired, can record the number and 

 sizes of ties, or fence posts or other products that are con- 

 tained in the trees, and also the number of poles and their 

 lengths. A complete estimate should give the amount and 

 kinds of all material that can be cut from the woodlot. 



ESTIMATING A LARGE WOODLOT FOR BOARD FEET 



To estimate each tree in a large woodlot in this way would 

 require a great deal of time and labor. It is possible to pick 

 out several sample acres that are representative of the entire 

 woodlot if the trees are fairly uniform, and find the average 

 board feet per acre. Then by multiplying by the number of 

 acres in the woodlot an estimate for the entire woodlot will 

 be obtained. (A simple method of finding the number of acres 

 in a woodlot is described in the Appendix.) Great care and 

 judgment must be used in selecting the sample acres to be 

 estimated. They should neither be located in the best portion 

 of the timber nor in the poorest. The sample acres should be 

 average acres. Not less than 4 or 5 acre plots should be 

 estimated for a 20-acre woodlot to secure a good result. The 

 number of board feet on all the sample plots estimated added 

 together and then divided by the number of sample acres 

 measured will give the average number of board feet per 

 acre. Square acre plots can be laid out 208 feet on a side. 



