. The Cuba review. 24 THE CUBA R E V I E W VALUE OF THE CUBAN PINE (Pinus heterophylla) ITS PHYSICAL PROPERTIES ACCORDING TO U. S. GOVERNMENT ANALYSIS Weight of dry wood: pounds per cubic foot. Specific gravity : Ash : per cent of weight of dry wood (Sargent). Fuel value: Equal to white oak (Sar- gent,). Breaking strength (modulus of rupture) : 16,400 pounds per square inch, or 102 per cent of that of longleaf pine (Sargent). Factor stiffness (modulus of elasticity) : 2,243,000 pounds per square or 106 per cent of that of longleaf pine (Sargent). Character of qualities : Very h
. The Cuba review. 24 THE CUBA R E V I E W VALUE OF THE CUBAN PINE (Pinus heterophylla) ITS PHYSICAL PROPERTIES ACCORDING TO U. S. GOVERNMENT ANALYSIS Weight of dry wood: pounds per cubic foot. Specific gravity : Ash : per cent of weight of dry wood (Sargent). Fuel value: Equal to white oak (Sar- gent,). Breaking strength (modulus of rupture) : 16,400 pounds per square inch, or 102 per cent of that of longleaf pine (Sargent). Factor stiffness (modulus of elasticity) : 2,243,000 pounds per square or 106 per cent of that of longleaf pine (Sargent). Character of qualities : Very heavy, hard, strong and tough ; grain fine and straight compact, annual rings wide, summerwood very broad, occupying fully lialf width of the annual growth; very resinous, con- spicuous resin passages numerous, large; medullary rays numerous, rather promi- nent ; color, rich dark orange, the sapwood lighter, often nearly white, durable. Growth : Height, 75 to 100 feet; diameter, 1V2 to 3 feet. It- is a Cuban and Mexican tree, and its geographical location suggests that it may have entered the United States by way of the Florida Peninsula. Four important timber trees of the south- eastern United States are usually grouped as one in the lumber market, and are sold under the common name of yellow pine. They are the longleaf pine, shortleaf pine, loblolly pine, and Cuban pine. In appearance the woods of these four trees are so nearly alike that it is sometimes dilficult to distinguish one from the other; yet in some particulars there is considerable difference. This is often seen in the growth rings. Longleaf annual rings are usually narrow; shortleaf, wide near the heart, followed by a zone of narrower rings, while loblolly's rings are generally wide. The Cuban pine also has wide rings. The proportion of sapwood to heart is usually different in the four species. Longleaf pine over a foot in diameter, breast high, rarely has sapwood over 2 or 3 inches broad, shortleaf sapwood in tre
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