LOGGING IN THE DOUGLAS FIR REGION". 



161 



because of a breakdown in the loading or railroad department. 

 The system enables the loaders at all times to select the most desir- 

 able logs from the standpoint of making up a carload, which can 

 not be done with the single gin-pole method. Furthermore, better 

 settings can be secured for the yarding engines. In one instance 

 the logs were yarded in on one side of a ravine, while the railroad 

 and loading engine were operated on the other. The bottom of this 

 ravine was about 30 feet below the level of the track, providing 

 storage space for more than 600 logs. The largest yarding output 

 can easily be handled with this method. Landings may or may not 

 be used. Some operators feel that they are essential because they 

 protect the cars and facilitate ground yarding. In any case they 

 are simple in construction (fig. 61). 



TH/ieE SHE Ave Tfiee 



10 /f/ YAHDIUG BUOCK 



Fig. 66. — Overhead loading system. 



(2) A standing line is used with the other type of overhead sys- 

 tem (fig. 65). Two well-guyed trees or gin poles are used, one on 

 each side of the track. These can be anywhere from 200 to 800 feet 

 apart, the distance depending on the chance, and so located as to per- 

 mit the loading of logs from either side of the track at one setting. 

 A l|-inch standing line is stretched taut from one pole to the other 

 at from 40 to 60 feet from the ground. A 14-inch four-sheave car- 

 riage, riding the standing line, can be racked in either direction at a 

 speed of about 800 feet per minute by two three- fourths inch trip lines. 

 The trip lines, leading from opposite ends of the carriage, pass 

 through 14 by 2 inch corner blocks suspended at the top of the gin 

 poles to the two upper drums of a three-drum, four-cylinder loading 

 engine. The seven-eighths to 1 inch main or lifting line, leading 

 from a tail hold on one of the gin poles, passing through the two 

 lower sheaves of the carriage, looping down and supporting a 14 by 2 

 inch fall block in the bight of line, then through a 14 by 2 inch 

 61361°— Bull. 711—18 11 



