3654 



General Index 



Growth (continued) 



growth rates of major pine-site 

 hardwoods, 49-119 



per acre, of hardwoods, 39 

 Growth rings 



characteristics of, 21 1 



concentricity of, 211 



definition of, 210 



distribution of chemical compounds in, 

 378, 379 



illustrations, by species, 214-225, 

 243-267 



method of distinguishing, 212 



number of cells in radial file, 210 



variation of specific gravity across, 492, 

 514 



vessel size and arrangement across, 212, 

 243-267 



width of, related to height in tree, 21 1 

 Gum 



black. 113 



red, 108 



sap, 108 

 Hahn harvester, 1580 

 Handles; see Tool handles 

 Hardboard, 2744, 2824 



classification of, 2876 



consumption by furniture industry, 2592 



diffusivity, 696 



energy, manpower, and capital 

 requirements, 2558, 2560, 2562 



equilibrium moisture content, 585-589, 

 2863 



imports and exports, 3600 



production capacity in U.S., 2745, 3599, 

 3600 



specific energy required, 2765 



standards and properties, 2891 



thermal conductivity, 693, 694 



treatment for preservation, 2528 

 Hardness 



bark, 1211 



wood, 739, 740, 769, 770, 773, 775, 

 777, 780 



species-average values for wood, 770 

 Harvesting 



balloon and helicopter logging, 1575 



biomass distribution, 1428-1494; see also 

 Biomass data 



cable yarding, 1563 



capital depreciation associated with, 2562 



clearcutting small hardwoods, 1578 



difficulties of, 3, 1427 



ecological effects, 1506 



economic feasibility analyses, 351 1, 

 3517 



energy expended, 1608-161 1 , 2558 



factors affecting, 1498 



light machinery to skid and bunch, 1594 



logging residues, 1487 



man-hour requirements, 2560 



productivity and costs, 1499, 1534, 

 1535, 1550, 1567, 1571, 1575, 1577, 

 3511,3517 



residue harvesting, 1598, 3511, 3517 



stump and tree pullers, bunchers and 

 processors, 1549, 1682 



systems in wide use, 1518 



transport, loading, offloading, and 

 storing, 1600 



value maximizing of trees and stems, 

 1537, 3571 

 Headrigs; see Sawmills 

 Heartwood, 207, 226 



ash content, 230 



color, 227 



decay resistance of, 813-816 



differences from discolored wood, 234 



distinguishing, 233 



electrical resistance, 235 



extractives in, 399 



formation of, 230 



illustration, by species, 214-225, 229 



mineral content in, 449, 451 



moisture content, 231, 554, 565, 566 



pH, 230, 235, 453 



permeability, 627-629, 632, 633 



proportion of stem volume, 235 



shrinking and swelling, 596, 602, 603 



specific gravity, 514-543 



strength of, vs. sap wood, 777-780 



ultimate analysis of, 366 

 Heat content of various fuels, 3237 

 Heating veneer bolts, 2148 

 Heat of combustion, 702, 3160 



bark, 703, 704, 849, 1221-1226, 3160 



charcoal, 705 



foliage, 703 



residues, 567, 704, 849, 1225, 1226 



species list, 703 

 Heat of sorption 



of bark, 1188 



of wood, 613 

 Height 



of 6-inch pine-site hardwoods, 50 



variation of moisture content with, 565, 

 566 



variation of specific gravity with, 514-543 

 Helical cutting, 1833-1842 

 Helical thickening of cell walls, 292 

 Hemicelluloses, 381 



components of, 370-373, 381, 382 



