Three methods--radial compression strength, color indicators of decay and micro-toughness, an examination of tracheid fracture patterns, were evaluated for detection of early decay and for application to field use. Three-eighth-inch diameter plugs 3/4-inch long, cut from the sapwood and heartwood of a Douglas-fir pole free of decay, were decayed by...
In an exploratory survey of the serviceability of wood in the
marine environment in the Pacific Northwest, pressure-creosoted
piling with tops protected from wetting by the superstructure provided
40 and more years of service and showed little or no indication
of deterioration. The service life of these piling is still...
Wood degrading ability and tolerance to wood-preserving chemicals
of several fungi isolated from Douglas-fir utility poles were
investigated by the agar-stick and soil-block methods. Birch (Betula.
sp. ) wood sticks and western hemlock (Tsuga heterophylla) wood blocks
were used.
The soil-block and agar-stick tests provided identical weight
loss rankings of...
Three groups of experiments were performed to determine an effective
procedure for controlling decay in southern pine (Pinus spp.)
laminated timbers. (i) A decaying laminated arch of southern pine was
treated with chloropicrin. Movement of the chemical vapor through the
arch and its effect on the decay and nondecay fungal...
The response of three hardwoods from Ghana and a hardwood and
three softwoods from the United States to liquid and gas-phase impregnation
was investigated. Impregnation with liquids included a sink-float
test in a water-glycerine solution and pressure treatment with a copper
sulphate solution and creosote under identical treating conditions.
Flow...
Temporal and spatial patterns of daytime cloudiness in the
Willamette Valley of Oregon were studied by utilizing monthly and
daily sky cover data published by the U. S. Weather Bureau for the
Portland, Salem, and Eugene stations. The 15-year period, 1949
through 1963, was selected as the maximum reliable period...
