164 BULLETIN 711^ V. S. DEPARTMENT OF AGEICULTUEE. 



SWINGING BOOM LOADING DEVICE. 



It has been found in handling medium to small-sized logs in 

 heavy stands with the Lidgerwood tree-rigged skidder that not in- 

 frequently more logs can be yarded than can be loaded with the guy- 



FiG. 67. — Swinging-boom loading system. 



line loading method. To remedy this defect some operators are using 

 a swinging boom of the type shown in figure 67. 



The boom is about 50 feet long and made of a 16 by 16 inch timber, 

 tapered down to 12 by 12 inches at each end. The end that is at- 

 tached to the head spar tree is stepped on the under side, and has a 

 hole about 1 inch larger than the pin. It is fastened to the tree by 

 two 2-inch eye bolts. 



