FLOATING AND RAFTING 
403 
logs are to be manufactiircHl, and extensive log storage facilities 
also are often provided. Both the assorting and storage works 
are generally owned by corporations. 
The storage booms form large pockets extending sometimes 
for miles along one or both sides of the stream, into which logs 
are shunted until the assorters are ready for them, and also 
to hold assorted logs until wanted for manufacture. The outer 
boundaries of these pockets are formed by single Ijooms made 
Photograph by R. B. Miller. 
Fig. 143. — Log Storing and Assorting Works on the St. John's River. New 
Brunswick. 
from logs 2 or 3 feet in diameter fastened together with 1- or Ij- 
inch chains. The boom sticks are held in place in midstream 
by piers or nests of piling placed 75 or 100 feet apart. 
Piers 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 with- 
stand. 
In cold regions, they are built when the stream has an ice cover- 
ing strong enough to bear up heavy loads. An opening is cut 
through the ice slightly larger than the base of the crib, and in 
this opening the crib is built. The foundation timbers are placed 
in position and a floor of poles or planks placed over them. As 
the crib framework is built up, the structure is loaded with 
stones, thus sinking it as the work proceeds. Cribs are some- 
