The steadily increasing costs of raw materials, of the treated products, and of their replacement in service, as well as the steadily shrinking supply of preferred species, prompted a forum at Oregon State University on May 15, 1973 "to encourage the use of western hemlock and western fuss for poles...
The wood of black locust, Robinia pseudoacacia, is used chiefly for insulator pins, wagon hubs, treenails, fence posts, and mine timbers. For these uses it is admirable because of its hardness, strength, and durability. A valuable characteristic of the tree is its rapid growth on many types of soils during...
Douglas-fir bark, 3/4 inch and 1 1/2 inch in size, was tested in recirculating trickling filters 1, 2, and 3 feet in depth, hydraulically loaded at 2.27, 4.54, and 9.08 gallons per minute per square foot (gpm/sq.ft.) with 2 and 4 percent poultry manure slurry at 70° F. Preliminary tests...