452 LOGGING 
A 50-inch log, or two 30-inch logs, side by side, could be floated in the flume, 
except at the gates. The logs ran three to the thousand board feet, and the 
average daily capacity of the flume was 150,000 board feet. Twenty-four 
milhon board feet have been handled in seven and one-half months. 
Page 441. The Allen flume had a 34-inch V-shaped box, the angle at the 
vertex being 63 degrees. The box was made of six boards 16 feet long, five 
of which were 2§ by 11 inches, and the sixth 2^ by 12 inches. The cracks 
were battened by 1- by 4-inch strips. A 6- by 6- by 6-inch backbone was 
fitted into the vertex. The box was supported on trestle work, composed 
of 4- by 4-inch uprights, braced diagonaUy with two 2- by 4-inch timbers, 
on top of which was a 4- by 4-inch cap. The trestles ranged in height from 
2 feet to 72 feet, the longest one being 775 feet. The flume box was braced 
by 2- by 4-inch timbers placed against the sides of the box and supported 
by other timbers of the same size. These timbers rested on the caps. 
Water was supplied both from a reservoir at the head, and by numerous 
flume feeders placed along the route which was about 15 miles in length. 
The grade varied from 0.5 per cent to 12.5 per cent. 
There were twenty rock cuts from 8 to 20 feet in depth and one tunnel 
685 feet long. 
The flume had a capacity of 3500 logs daily, an average of 116,000 board 
feet. 
The fluming season was about five and one-half months. 
Page 450. The American Gulch flume, approximately 1 mile in length, in 
the Deerlodge National Forest in Montana, had a 30-inch V-box which was 
chiefly supported on stringers laid on the ground. Very few trestles were 
constructed. The flume could handle mining stulls 15 inches in diameter 
and from 14 to 16 feet long. Thirty-three thousand board feet of lumber 
and 2755 pounds of nails were used in the construction of the box. Seven 
men built a mile of flume in twenty days. 
BIBLIOGRAPHICAL NOTE TO CHAPTER XXIII 
Martin, J. P. : The Design of Log Flumes. Engineering News, Nov. 14, 
1912, pp. 908-913. 
Robertson, J. E. : The Log Flume as a Means of Transporting Logs. 
The Timberman, August, 1909, pp. 45-46. 
Starbird, W. D.: Flumes. The Timberman, August, 1912, pp. 42-44. 
Steel, Francis R.: Lumber Flumes. Bulletin of the Harvard Forest 
Club, Vol. I, 1911. 
