LOGGI]SrG"IN THE DOUGLAS FIR EEGION. 



157 



The statement includes equipment in use as well as on hand. 



If a fall block is used, the fixed investment will amount to $2,739. 

 If a fall block is used and the power is furnished by a loading 

 drum rather than by a separate loading engine, the fixed investment 

 will amount to about $500, the cost of the loading drum amounting 

 to $150. 



U3AOWG BLOC^. 



Fig. 62. — Single ^y-line loading system. 



OVEEHEAD METHODS. 



In the last few years overhead loading systems have, been adapted 

 to coast timber. These systems, while varying considerably in de- 

 tails, are based on two rather distinct principles: 



(1) One overhead loading system has no standing line (fig. 63), 

 It has two wire-guyed gin poles, which are from 100 to 200 feet 

 apart. The head pole is about 60 feet in height and erected on the 

 side of the track opposite the landing. The tail pole is from one- 

 fourth to one-third the height of the head pole and placed back of 

 the landing. Occasionally it is possible to use a high stump for 

 a tail tree. The |-inch main or hoisting line leading from the 

 main drum of a separate loading engine is reeved through a double- 

 sheave corner block suspended at the top of the head pole and a 

 single-sheave fall block hung in the bight of the line, the tail hold 

 being taken on the fall block. Another line, the trip line, about 

 five-eighths inch in diameter, leading from another drum on the 

 engine, passes through a 12 by 2 inch corner block at the top of the 



