162 BULLETIN 111;, U. S. DEPARTMENT OF AGEICULTUEE. 



corner block on the other gin pole, and thencef to the lower drum of 

 the engine. The lifting line is handled independently of the trip 

 lines, making it possible to raise or lower the load while the carriage 

 is running on the standing line. 



The fixed investment with this method varies considerably, depend- 

 ing for the most part on the distance between the spar trees. It 

 \Y0uld seem that it should never exceed $5,337 at one side, as follows : 



1 four-drum loading engine $2, 700 



2 sets of guy lines 200 



1 standing line i 550 



1 14-inch four-sheave carriage 150 



2 trip lines 330 



1 loading line . 300 



7 14 by 2 inch blocks 147 



2 tree shoes 60 



1 spotting line 100 



Loading-engine repair parts and materials 75 



I-oading-engine sled 250 



Oil-burner equipment, including oil and water tank ^ 375 



Miscellaneous equipment 100 



Total 5,337 



Where it is desired to load on only one side of the track at a 

 setting, only one trip line is used. The scheme is shown in figure 66. 

 Under such conditions the fixed investment should not exceed $4,900, 

 since the cost of blocks and trip line is less. 



GUY-LINE METHOD. 



The guy-line method of loading is not infrequently employed with 

 overhead and high-lead yarding methods, for which it is particularly^ 

 adapted. As a rule, the head spar tree used with these yarding 

 methods is guyed with from 6 to 11 lines, 2 of which can be so 

 arranged as to permit the attachment of a loading block at a point 

 directl}^ over the center of the track and about 60 feet from the 

 ground (fig. 62). The loading line, leading from its drum on 

 the loading engine, passes through a block on the head spar tree, 

 thence through the loading block suspended to one of the loading 

 guy lines. In some cases the latter block is attached to a loading 

 carriage, which in turn is supported by the loading guy line. A pair 

 of tongs is attached to the loading line, the weight of which is suffi- 

 cient to prevent the loading line from running back through the 

 block. Where the yarding and loading engines are mounted on sep- 

 arate sleds the location of the loading engine, as related to the loca- 

 tion of the yarding engine, depends on the chance. The yarding and 

 loading engines may be placed side by side on the same side of the 

 track, as near the foot of the head spar tree as possible.^ with the 

 loading engine next to the track, the logs being loaded directly to 



