300 



LOGGING 



(M) can only be opened and closed gradually, thus avoiding 

 heavy shocks on the cable. In addition to the hydraulic cylinder 

 brakes the machine is equipped with emergency brake bands and 

 wooden friction blocks. The cable and empty cars are returned 

 to the head of the incline by an auxiliary steam-driven engine. 



A snubbing device of the above character was operated on a 

 4500-foot incline on which there was a difference of 1300 feet 

 elevation. The grade on a portion of the road was 50 per cent 

 and averaged 30 per cent for the entire distance. 



Fig. 85. — A Hydraulic Snubbing Machine a, side view, b, top view. 



One car holding 6000 feet, log scale, a total weight of about 

 20 tons, was lowered with a i-inch plow steel cable. A greater 

 number of cars could have been handled by increasing the size 

 of the cable, but since the daily requirements were only 30,000 

 feet, log scale, this was unnecessary. 



In a western operation, which had a 20 per cent grade near 

 the end of its logging railroad, the problem of lowering cars was 

 solved in the following manner: A track was built up the slope 

 from the main line to a bench on which a yarding engine was 



