364 



LOGGING 



facilities also are often provided. Both the sorting and storage 

 works are generally owned by corporations (p. 368). 



The storage booms consist of large pockets, extending some- 

 times for miles along one or both sides of the stream, into which 

 logs are shunted until the sorters are ready for them, and also 

 to hold sorted logs until wanted. The outer boundary of these 

 pockets is formed by single booms consisting of logs from 2 to 3 

 feet in diameter fastened together with i-inch or i j-inch chains or 

 other devices. The boom sticks are held in place in midstream 

 by cribs or nests of piling placed 75 or 100 feet apart. 



Phaloaraph by R. B. Miller 



Fig. 109. — Log Storing and Assorting Works on the St. John River. New 

 Brunswick. 



Cribs are built of round logs from 16 to 24 inches in diameter 

 and of various sizes depending on the character of stream in 

 which they are placed and the amount of strain they must 

 withstand. The foundation is laid on bedrock or solid 

 bottom and the frame built up in the form of a square or 

 rectangular crib. In some cases the cribs are built rectang- 

 ular in form above the water, but usually the upstream face is 

 drawn in at an angle of from 30 to 40 degrees and planked 

 over. The sloping face prevents ice and driftwood from form- 

 ing a jam behind the crib and causing it to be carried away. 



