Douglas fir


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Douglas fir:

see pinepine,
common name for members of the Pinaceae, a family of resinous woody trees with needlelike, usually evergreen leaves. The Pinaceae reproduce by means of cones (see cone) rather than flowers and many have winged seeds, suitable for wind distribution.
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Douglas fir

A strong, medium-density, medium-textured softwood; widely used for plywood and lumber in construction.

ebony

Wood of a number of tropical species, usually distinguished by its dark color, durability, and hardness; used for carving and ornamental cabinetwork.

elm

A tough, strong, moderately high-density hardwood of brown color; often has a twisted interlocked grain; used for decorative veneer, piles, and planks.A softwood of the temperate climates including Douglas fir, white fir, silver fir, and balsam fir; used for framing and interior trim.

folded plate

A thin skin of plywood reinforced by purlins to form tructures of great strength.

glue-laminated arch

An arch made from layers of wood that are joined with adhesives. The glued joints transmit the shear stresses, so the structure acts as one piece capable for use in structural arches and long-span beams.

gum

A moderately high-density hardwood, whitish to gray-green in color and of uniform texture; used for low-grade veneer, plywood, and rough cabinet work.

hardboard

A dense smooth-surfaced composition board composed of highly compressed fibers; one such type is called Masonite®.

hardwood

Timber from all trees except the conifers, which are called softwood.

heartwood

The center portion of a tree trunk that is no longer growing or carrying the sap; often harder and denser.

hemlock

Wood of a coniferous tree; moisture-resistant, soft, coarse, and uneven-textured; it splinters easily and is inferior for construction use.

hickory

A tough, hard, strong wood; has high shock resistance and high bending strength.

laminated timber

Timber beam or arch manufactured from four or more layers of wood, usually about 1 inch thick, bonded together with waterproof adhesive.

larch

A fine-textured, strong, hard, straight-grained wood of a coniferous tree; heavier than most softwoods.

lath

Narrow strips of wood that serve as a base for plaster, usually nailed to studs in walls or rafters in ceilings.

limba

A straight-grained, fine-textured wood used for interior paneling.

locust

Wood of the locust tree; coarse-grained, strong, hard, decay-resistant, and durable.

mahogany

A straight-grained wood of intermediate density, pinkish to red-brown in color; used primarily for interior cabinetwork and decorative paneling.

maple

A hard, tough, moderately high-density wood, light to dark brown in color, with a uniform texture; used for flooring and wood trim.

Douglas Fir

 

(Pseudotsuga menziesii’, better known by the incorrect name P. taxifolia), an evergreen coniferous tree of the family Pinaceae, named for the Scottish botanist D. Douglas (1798-1834). The trees grow 50-75 (100) m tall and 1.2 to 2 (4) m in diameter. The crown is cone-shaped. The needles are flat and stand out in all directions. The female cones are 7 to 10 cm long with rounded seed scales; the covering scales are narrow with a bifurcated tip and a well-developed central vein that extends in an awl-like fashion above the lobes. The tree suffers (and sometimes dies) from spring and autumn frosts and prolonged drought, but it is relatively tolerant of various types of soil. The Douglas fir begins to bear cones after ten to 25 years and can live up to 500 years. It grows wild along the Pacific coast of North America. In the USSR it is found in gardens and parks of the Caucasus and in the southern Ukraine. The wood is used in buildings, ships, furniture, and railroad cars. The bark contains tannins.

S. K. CHEREPANOV

Douglas fir, Oregon pine, red fir, yellow fir

A strong, medium-density, medium- to coarse-textured softwood; widely used for plywood and as lumber and timber in construction work.
References in periodicals archive ?
Those factors, in combination with lots of Douglas fir and with large springtime fungal spore production, have us where we are now.
CUT: (4) 33 1/2" lengths of Douglas fir 2x4 stud stock.
Douglas fir is one of the most versatile of the domestic wood species, with uses that include plywood, heavy construction, studding, floor boards, roof trusses, floor and ceiling joists, beams, interior and exterior joinery, marine piling, mining timber and dock and harbor-building material.
The mean diameter of Douglas fir in old-growth stands was significantly larger in red tree vole habitats than in unoccupied habitats, and the average diameter of tanoak (Lithocarpus densiflorus) was significantly less (Table 2).
In oak areas, the focus will be on removing Douglas firs, Steel said.
The Douglas fir was named after Perthshire environmentalist David Douglas, who was born 200 years ago.
Douglas fir has a light-colored sapwood and a reddish-brown heartwood.
Kintigh, who has been raising them since 1955, says that the Douglas fir remains most popular among his customers, but that the noble is gaining on it.
FSC-certified products include framing lumber made of hemlock fir, larch fir, Douglas fir and southern yellow pine, hybrid poplar logs, as well as decking, siding, boards, and finger-jointed boards made of red cedar.
George Hermach says removing Douglas fir trees in the Mount Pisgah area represents a "gross violation of nature" (letters, July 8) but the gross violation is his opinion of what constitutes credible ecological and silvicultural management.
IT TOOK them 18 hours to travel 70 miles, but two giant Douglas fir trees finally completed their unhurried journey to the Royal Welsh showground.
A magnificent Douglas Fir tree at Lake Vyrnwy, a nature reserve managed by RSPB Cymru, has been officially confirmed as the tallest tree in Wales - and the joint tallest in Britain.