POLES AND PILING 



311 



lengths, trimming off the branches, peeling, skidding, and hauling to the 

 railroad, driving or floating to the pole yard.^ 



Pole logging is the cheapest form of logging per unit of volume, since 

 practically the whole tree trimk is taken out in one operation. 



The following table is interesting as showing the size of trees of various 

 diameters, taken at breast height (4I ft.) required to yield poles of 

 specified lengths and top diameters. It was devised as a result of the 

 measurement of 478 western red cedar trees in northern Idaho by officials 

 of the Forest Service: 



The following table shows just the reverse of the above table in that 

 it gives the sizes of poles that may be obtained from trees of different 



' For details regarding general logging methods see " Logging," by R. C. Bryant, John 

 Wiley & Sons, New York City. 



