FLUMES AND LOG SLUICES 



413 



Page 404. The Allen flume has a 34-inch V-shaped box, the angle at the vertex 

 being 63 degrees. The box is made of six boards 16 feet long, five of which are 

 2^ by II inches, and the sixth 25 by 12 inches. The cracks are battened by i- by 

 4-inch strips. A 6- by 6- by 6-inch backbone is fitted into the vertex. The box is 

 supported on trestle work, composed of 4- by 4-inch uprights, braced diagonally 

 with two 2- by 4-inch timbers, on top of which is a 4- by 4-inch cap. The trestles 

 range in height from 2 feet to 72 feet, the longest one being 775 feet. The flume 

 box is 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 rest on the caps. 



Water is supplied both from a reservoir at the head, and by numerous flume 

 feeders placed along the route which is about 15 miles in length. 



The grade varies from 0.5 per cent to 12.5 per cent. 



There are twenty rock cuts from 8 to 20 feet in depth and one tunnel 685 feet 

 long. 



The flume has a capacity of 3500 logs daily, an average of 116,000 board feet. 



The fluming season is about five and one-half months. 



The cost of construction was approximately S4000 per mile, and at the end of 

 four years $500 per mile were expended in repairs on ten miles of flume. 



Page 411. The American Gulch flume, approximately i mile in length, in the 

 Deerlodge National Forest in Montana, has a 30-inch V-box which is chiefly sup- 

 ported on stringers laid on the ground. Very few trestles are employed. The 

 flume can handle mining stulls 15 inches in diameter and from 14 to 16 feet long. 

 Thirty-three thousand feet of lumber at $24 per thousand delivered, and 2755 

 pounds of nails were used in the construction of the box. Seven men built a mile 

 of flume in twenty days at the following reported cost per mile. 



Supplies and labor. 



Lumber: 



Stumpage at $4.00 



Logging, manufacture and hauling at $24 



Nails: 



2755 pounds at 5 cents, deliv^ered 



Labor: 



I man at $4 per day $ 4 . 00 



6 men at $3 per day 18 . 00 $22 . 00 



20 days' labor at $22 



Total per mile 



$132.00 

 792.00 



138.00 



440 . CO 



$1502.00 



BIBLIOGRAPHICAL NOTE TO CHAPTER XXIH 



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. 



