Logging; the principles and general methods of operation in the United States . illustratedby one built in Washington for the transport of 40,000 boardfeet of lumber and crossties daily. The product to be handledranged in length from 8 to 32 feet. The flume had a maximum height of 128 feet, maximumcurves of 8 degrees, and a 3 per cent grade on the upper part per cent on the lower end. Lumber floated at the rateof 3 miles per hour. Bents were placed ^^^t apart for heights of 6^, feet andunder, and feet apart for heights in excess of this. Thebatter posts on all trestles under
Logging; the principles and general methods of operation in the United States . illustratedby one built in Washington for the transport of 40,000 boardfeet of lumber and crossties daily. The product to be handledranged in length from 8 to 32 feet. The flume had a maximum height of 128 feet, maximumcurves of 8 degrees, and a 3 per cent grade on the upper part per cent on the lower end. Lumber floated at the rateof 3 miles per hour. Bents were placed ^^^t apart for heights of 6^, feet andunder, and feet apart for heights in excess of this. Thebatter posts on all trestles under 75 feet were spaced 4 feet apartat the cap, and for heights greater than this 5 feet. The batterin all cases was i in 4. In the bent construction only threesizes of lumber were used, namely, i- by 6-inch, 2- by 6-inch,and 2- by 4-inch, the latter being used for the fore-and-aft brac-ing. As a rule only 16- and 24-foot lengths were used, becausethis simplified the work, reduced the time lost in handling, andvery little lumber was wasted. A select common grade of 4o6 LOGGING. n-p i« 6 6 1 1 . 11^ |l ^i t--i t*- 1 >Ki- o o O 0 ± a, FLUMES AND LOG SLUICES 407 lumber was used, which was worth $12 per thousand. Thefirst 24 feet of each bent was framed on the ground, the foot ofeach batter post being laid on or near the mud-sill on which itwas to rest. Bracing was made from i- by 6-inch and 2- by6-inch material. When ready, the bent was hoisted in place,and set on the mud-sills by the aid of a block and tackle attachednear the top of the nearest bent. When in position it wasplumbed up and spiked to the mud-sill. A 2- by 6-inch by 16-foot timber was then placed against the outside of each post andsecurely nailed to it with 20-penny spikes. Fore-and-aft braces(Fig. 125) were then nailed on until the top of the 16-foot postwas reached when another 2- by 6-inch by 16-foot timber wasset on top of the first post with a lap of 8 feet on the innerone. More fore-and-aft braces were then
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcet, bookyear1913
