244 
LOGGING 
been used in exceptional cases for distances as great as 2000 feet, 
but this is not considered profitable as a general practice. 
The chief advantages of the high-lead over the ground system 
are (a) the front ends of the logs are elevated and, therefore, 
do not hang up on stumps, rocks and other obstructions, or dig 
36" High Lead Block 
9"xlO><''Duplux Loading Engine /"^ 
with third drum for snubbing cars /•5' 
From Bui. 711, U. S. Dept. of Agricidture. 
Fig. 77. — Arrangement, of High-lead Skidding and Loading Equipment. 
Pacific Coast. 
into the ground so much when crossing depressions; (b) a special 
landing is not required, although the saving in cost due to this is 
largely offset by the cost of rigging the spar tree; (c) two moves 
only are necessary to log an area at one landing as compared to 
four for a ground system; (d) the loading area can be kept rela- 
tively free from debris and yarding, therefore, may be more 
continuous; (e) and a higher skidding speed^ may be used as soon 
1 Two-speed engines are used, the lower speed being employed to haul the 
logs up to a point where the forward end of a log can be elevated, and the 
higher speed to bring the log from this point to the landing. THe change 
from one speed to another may be made instantaneously. 
