LOGGING IN THE DOUGLAS FIR REGION. 193 
includes the cost of yarding the material to the track and building 
the trestle, and also a rental of $5 per day on the equipment. The 
bents consisted of three piles, the highest point on the trestle from 
the ground being 12 feet. Rough hemlock timber was used for 
piling, caps, and stringers. 
Case 7. — The cost of building the following pile-bent trestle was 
$389.05, or $2.28 per linear foot. This total does not include the 
value of the timber used for piling, nor the value of the sawed caps, 
stringers, and bracing. 
Structure. 
Total length feet__ 170 
Number of piles 39 
Average length of piling feet 20 
Average penetration of piling feet 10 
Sawed caps 7 
Sawed stringers, 8 by 16 inch Douglas fir. 
Bracing, 300 feet b. m. (3 by 12 inch). 
Alignment : 100 feet, 28° ; 70 feet tangent. 
Cost. 
Moving machinery to place $42. 77 
Yarding material to site 33. 75 
Driving piling 117. 36 
Placing stringers and caps , 77. 46 
Laying track 18. 50 
Excavating 17. 12 
Surveying 19. 09 
Drift bolts, 200 pounds, at $2.25 per 100 pounds 4. 50 
Rent of equipment 58. 50 
Total 389. 05 
The cost of driving piling for pile-bent-trestle construction varies. 
In one case piling was driven, cut off, and capped at the rate of $1.86 
per pile. 
The daily cost was as follows : 
Foreman $4. 00 
Engineer 3. 50 
Fireman 2. 75 
3 men, at $3 9. 00 
Total labor cost 19.25 
Rental on equipment 10. 00 
Total cost 29.25 
Average daily output, 16 piles driven and capped. 
This trestle was 2,000 feet long and consisted of three-pile bents, 
spaced 16 feet apart. It averaged about 10 feet in height, the pene- 
tration of the piling averaging about 15 feet. 
61361°— Bull. 711—18 13 
