Chapter 6 No.6

Western Yellow Pine. Bull Pine.

Bull refers to great size of trunk.

Pinus ponderosa Lawson.

Pinus, the classical Latin name; ponderosa refers to great size of trunk.

Habitat.

Habitat: (See map); best in Rocky Mountains.

Characteristics of the Tree: Height, 100' to 300'; diameter, 6' to even 12'; branches, low, short trunk; bark, thick, dark brown, deep, meandering furrows, large, irregular plates, scaly; leaves, in twos or threes, 5" to 11" long; cones 3" to 6" long.

Appearance of Wood: Color, light red, sap-wood, thick, nearly white, and very distinct; non-porous; rings, conspicuous; grain, straight; rays, numerous, obscure; very resinous but ducts small.

Leaf.

Physical Qualities: Weight, light (44th in this list); 25-30 lbs. per cu. ft.; sp. gr. 0.4715; strength, medium (45th in this list); elasticity, medium (41st in this list); hardness, medium (42nd in this list); shrinkage, 4 per cent.; warps ...........; not durable; hard to work, brittle; splits easily in nailing.

Common Uses: Lumber, railway ties, mine timbers.

Remarks: Forms extensive open forests.

Cross-section, magnified 37? diameters.

Radial Section, life size.

Tangential Section, life size.