TIlViBER ESTIMATING. 



71 



estimate for each ''forty '^ then may be obtained by multiplying the 

 strips by five; but to insure greater accuracy in irregular timber 

 the cruiser makes short excursions at definite distances on each 

 strip, going both to right and left far enough to see the timber upon 

 all of the land and to judge as to its uniformity. He then corrects 

 the result obtained on the strip if his observations show him that 





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ii 



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Fig. 2.— a method of making strip surveys that is used in the Lake States. 



the remaining timber is either lighter or heavier than that which 

 he has counted and measured. 



The volumes of the trees are determined by estimating the num- 

 ber of 16-foot logs in trees of average height, using half logs if neces- 

 sary and guessing at the contents of the average log, or the number 

 of logs per 1,000 board feet. The tree count will then give the total 

 number of logs and total volume of the stand in board feet. 



