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LOGGING 
piles on top of one another. Cypress is used for the top log 
and tupelo for the lower ones. The bents are placed at 6-foot 
intervals and have two piles driven 56| inches apart, center to 
center. 
A pile driver crew for building a road of this character is made 
up of eight men who can cut and drive from twenty to thirty-six 
piles (from 60 to 100 feet of track) per day of ten hours. The 
Photograph by R. C. Hall. 
Fig. 102. — A Round-timber Framed Logging Railroad Trestle. The Skid- 
way on the right is several feet below the level of the track. Alabama. 
roads are built from 2 to 6 feet above the ground level, and the 
piles are sawed off at the desired height. 
Stringers 8 by 8 inches, or 8 by 10 inches, are laid on top of the 
piles and on these 6- by 8-inch by 8-foot crossties are laid, 24 
inches center to center. 
Framed Trestles. — These are made both of round and squared 
timbers, but if the former must be brought from a considerable 
distance it is advisable to use the latter because they are easier 
to fit, and are more durable. 
The frames, or bents, have four supports, or legs, fr6m 15 to 
