PITCH PINE. 31 



TABLE MOUNTAIN PINE (Pinus pungens). 

 PHYSICAL, PROPERTIES. 



Weight of dry wood. 30.75 pounds per cubic foot (Sargent). 



Specific gravity, .49 (Sargent). 



Ash. 0.27 per cent of weight of dry wood ( Sargent ) . 



Fuel value. 66 per cent that of white oak (Sargent). 



Breaking strength (modulus of rupture). 10,000 pounds per square inch, or 

 62 per cent that of longleaf pine (Sargent). 



Factor of stiffness (modulus of elasticity). 1,159,000 pounds per square inch, 

 or 55 per cent that of longleaf pine (Sargent). 



Property and qualities. Wood medium light, soft, strong, tough, compact; 

 grain rather coarse ; summerwood broad, resinous, conspicuous ; resin passages 

 numerous, large; medullary rays numerous, prominent; color light brown, the 

 thick sapwood nearly white; not durable in the ground. 



Growth. Height, 40 to 65 feet ; diameter, 18 to 40 inches. 



SUPPLY AND USES. 



Except in a few localities the table mountain pine is not abundant, 

 though its range includes parts of Pennsylvania, Maryland, District 

 of Columbia, West Virginia, Virginia, Kentucky, Tennessee, Georgia, 

 and North Carolina. It reaches its best development among the high 

 mountains of eastern Tennessee, where on rocky ledges it sometimes is 

 the prevailing forest tree, and in some parts of Pennsylvania it is 

 rather plentiful. It is known also as prickly pine, hickory pine, and 

 southern mountain pine. The timber is cut in all parts of its range, 

 but is nowhere an important commodity. The largest recorded utili- 

 zation of it has been in Pennsylvania, where considerable quantities 

 have been made into charcoal. A few logs are sawed into lumber, 

 which is never distinguished from other pines in the market. Some 

 of it is cut for cordwood in Maryland and Pennsylvania, but its fuel 

 value is below that of loblolly, pitch, or scrub pine. There is no 

 reason to expect that the tree will ever attain greater importance than 

 it now has. 



PITCH PINE (Pinus rigida). 



PHYSICAL PROPERTIES. 



Weight of dry wood. 32 pounds per cubic foot (Sargent). 



Specific gravity. 0.51 (Sargent). 



Ash. 0.23 per cent of dry weight of wood (Sargent). 



Fuel value. 70 per cent that of white oak (Sargent). 



Breaking strength (modulus of rupture). 10,300 pounds per square inch, or 

 64 per cent that of longleaf pine (Sargent). 



Factor of stiffness (modulus of elasticity). 838,000 pounds per square inch, 

 or 39 per cent that of longleaf pine (Sargent). 



Character and qualities. Medium light and soft, strong, brittle, grain fine, 

 uneven, and straight ; annual rings rather wide ; summerwood broad and dis- 

 tinct, very resinous; conspicuous resin passages numerous, large; medullary 



