FLUMES AND LOG SLUICES 



403 



loading stations. They may be made from 2- by 4-inch joists or 

 from solid 4-inch blocks (Fig. 123, ^ and B). 



Fig. 126. — a Five Leg Trestle for Heights Greater than 75 Feet. 



A practical type of trestle^ for a lumber flume under 75 feet 

 in height consists of two legs made from 2- by 6-inch joists, 

 doubled and braced (Fig. 125). For heights greater than 75 feet 

 a trestle with five legs is used (Fig. 126). 



1 Designed by F. M. Kettenring, C. E., Vancouver, Washington. 



