FLOATING AND RAFTING 
405 
The capacity of storage booms varies with the size and length 
of timber handled. The following table^ shows the area in 
acres required to store spruce logs of several sizes and lengths, 
and also the number of boom logs required to impound given 
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Fig. 144. — A Sorting Gap on the St. John's River near Fredericton. New 
Brunswick. 
quantities of timber when the logs are forced into a compact 
body by the current of the stream, all sticks floating on the 
surface. 
The average storage capacity of medium-sized white pine 
and yellow pine logs is approximately 250,000 board feet per acre. 
Average 
Average 
Average scale 
storage of 
1,000,000 feet 
length 
diameter 
per piece - 
Feet 
Inches 
Board feet 
Acre.s 
15.3 
5.9 
21.4 
13.41 
20.. 5 
6.7 
31.8 
11.94 
24.6 
10.4 
90.7 
8.15 
30.0 
15.6 
249.48 
5.34 
2 Blodgett rule. 
Assorting Equipment. — The main feature is the assorting gap 
where logs are separated and deflected into the storage pockets 
down stream. The usual type of assorting gap has two opposite 
rafts or bracket booms placed from 30 to 50 feet apart and con- 
nected by an elevated runway on which the assorters stand 
1 See Boom Areas, by A. M. Carter, Forestry Quarterly, Vol. X, No. 1, 
p. 15. 
