2i8 LOGGING 



This machine has been developed in the redwood region, and is 

 said to have the following advantages: 



(i) It enables the simultaneous operation of two different 

 gulches by one machine which is run by a single engineer and a 

 fireman. 



(2) On long hauls the time can be reduced by yarding logs 

 for a portion of the way with one set of cables, and then bringing 

 in the logs with the other set. The long distance line is returned 

 for another turn of logs while the second one is dragging the first 

 turn to the landing. 



(3) One cable can be used to yard logs located at a sharp 

 angle from the main road. The logs are dropped at the blocks 

 on the main road and picked up with a minimum loss of time 

 by the second line. 



So far as known this system is not in extensive use. 



Road Engines. — Road engines are semi-permanent in char- 

 acter and are not subject to as much strain in movement as 

 yarding engines. They may be mounted on skids or on a heavy 

 frame of timbers, and are operated for distances not exceeding 

 i\ miles. They use cables of a size similar to those employed 

 on yarding engines. 



Road engines may be used singly, in which case they are 

 located at the landing along a railroad, stream or at the mill; or 

 they may be used in batteries of two or three. The rear machine 

 hauls the logs up to the tail block of the succeeding road engine, 

 which in turn hauls them to the next one. 



It is seldom economical to employ more than two or three 

 machines in a battery because of the great expense for cable 

 and labor in comparison with the output. Railroads are always 

 built up to the first road engine, if possible, because of the 

 reduced operating charges. 



The general features of a road engine are similar to those of 

 a yarding engine except that the machinery is more powerful 

 and capable of operating for longer distances. The specifications 

 of one of the larger types of road engines are a 72- by 13 2-inch 

 boiler; 13- by 14-inch cylinders; 165 or 180 pounds' working 

 pressure; and a capacity of 7500 feet of i|-inch cable. 



