Principles of American ForestryJ. Wiley & sons, 1903 - 334 pagina's |
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amount autumn bark Basswood Birch Black Walnut Box-elder branches Bur Oak Catalpa Cedar climate close-grained conifers Cottonwood covered crops crowding cubic feet cultivation deciduous deciduous trees desirable durable in contact evaporation Evergreens fence posts Florida foliage forest fires forestry fuel grained Green Ash ground grow grown growth Hackberry hard hardy Heavy Height hypsometer IMPORTANT AMERICAN TIMBER injury interior finish Jack Pine kinds land leaves liable Light logs lumber manufacture method Minnesota moist soil mountain mulch Norway Norway Spruce nursery ornamental tree Pinus plant Poplar prairie prevent protection pruning pulp purpose Quercus rapid grower ripen roots season seedlings seeds shade slopes snow Soft Maple sown species spring Spruce strong stump Sugar Maple surface swamps TABULAR CLASSIFICATION Tamarack Texas TIMBER TREES transplanted tree-growth trunk White Pine White Spruce White Willow wind windbreak winter wood young seedlings
Populaire passages
Pagina 209 - The calory is the amount of heat required to raise one kilogram of water one degree Centigrade. The gram-calory is the amount of heat required to raise one gram of water one degree Centigrade.
Pagina 246 - ... sacrificed, shall be punished with a fine of not over five hundred ($500) dollars, or be imprisoned in the state prison for a term of not over ten (10) years, or both such fine and imprisonment.
Pagina 216 - ... place just under the bark of logs. These can be avoided, the curing of the timber hastened and its durability greatly increased by removing the bark soon after felling. When trees are cut in full leaf it is advantageous to let them lie at full length until the leaves are thoroughly wilted (2 or 3 weeks) before cutting to size. With conifers this is a good practice at any season, and while not practical, yet theoretically all winter-cut trees should be left to leaf out in the spring before being...
Pagina 23 - ... rain, snow and dew. There it is evaporated again, either immediately or after having percolated through the soil and been retained for a shorter or longer time before being returned to the surface, or, without such percolation, it runs through open channels to the rivers and seas, continually returning in part into the atmosphere by evaporation. Practically, then, the total amount of water capital remains constant; only one part of it — the circulating capital — changes in varying quantities...
Pagina 29 - ... maximum annual precipitation may reach 20 inches the evaporation during one year was 69 inches. This deficiency of 49 inches naturally must be supplied by waters coming from the mountains, where the precipitation is large and the evaporation low. (On Pike's Peak alone there may be 45.6 minus 26.8 or 18.8 inches to spare.) Evaporation from the soil is dependent upon its covering and this is important as the soil in forests is always covered with dead branches, leaves, etc. In some experiments...
Pagina 246 - ... person who wilfully, negligently or carelessly suffers any fire set by himself to damage the property of another, is guilty of a misdemeanor and shall be punished by a fine not exceeding one hundred dollars, or by imprisonment in the county jail not exceeding three months.
Pagina 23 - ... which, after the rest had fallen to the cooled earth, remained suspended and is never precipitated. The circulating water capital is that part which is evaporated from water surfaces, from the soil, from vegetation, and which, after having temporarily been held by the atmosphere in quantities locally varying according to the variations in temperature, is returned again to the earth by precipitation in rain, snow, and dew. There it is evaporated again, either immediately or after having percolated...
Pagina 32 - Foehn of twelve hours' duration has been known to "eat up" entirely a snow cover of 2£ feet deep. In Denver a chinook has been known to induce a rise in temperature of 57° F. iu twenty-four hours (of which 36° in five minutes) while the relative humidity sank from 100 to 21 per cent. The degree of forest influence upon rate of evaporation by breaking the force of winds is dependent upon the extent and density of the forest, and especially on the height of the trees. For according to an elementary...
Pagina 37 - The necessary conditions are those of the 'warm wave,' namely, a diminishing pressure to the northward, producing southerly winds which initially elevate the temperature above the normal. A cloudless sky favors an intense insolation, as a result of which the dry ground is soon raised to an extreme temperature, and the air is heated from it by radiation, reflection and conduction. The resulting diminution of density due to the rise of temperature furnishes impetus to previously existing horizontal...
Pagina 32 - What the possibilities of evaporation from hot and dry winds may be, can be learned from statements regarding the "Foehn," which is the hot wind of Switzerland, corresponding to the "chinook