FREE BOOKS

Author's List




PREV.   NEXT  
|<   48   49   50   51   52   53   54   55   56   57   58   59   >>  
the forest, but to the men who use the forest. This is peculiarly true of the practice of forestry in National and State Forests everywhere. FOREST PRODUCTS: Under this general subject, the forest student must acquaint himself, through the microscope, with the minute anatomy of the woody stem of coniferous and broadleaf trees, and the occurrence, form, structure, and variability of the elements which make it up. He should become familiar with the methods of classifying the economic woods of the United States, both under the microscope and with the unassisted eye, and for this purpose should know something of their color, gloss, grain, density, odor, and resonance both as aids to identification and as to their importance in giving value to the wood; the defects of timber; its moisture content, density, shrinking, checking, warping; and the effect of all these upon its uses. The chemical composition of wood and of minor forest products, such as tannins and dye stuffs, is important; the properties governing the fuel value and the other values of wood must be studied, as well as the methods of using these properties in the making of charcoal and wood pulp, in wood distillation, the turpentine industry, in tanning and dyeing, and in other industries. A field of great importance is the relation between the physical structure and the mechanical properties of wood. A student should inform himself concerning the standard methods of testing the properties of structural timber, by bending, compression, shearing, torsion, impact, and the hardness and tension tests, with their relation to heat and moisture, and the methods of seasoning, the use of preservatives, and the effect of the rate of application of the load. Woods vary as to their durability. It is important, therefore, to know about the causes of decay, the decay-resisting power of various woods, the relation of moisture content to durability, why the seasoning of wood is effective, the theory and the commercial methods of wood preservation, and its relation to the timber supply. LUMBERING: Lumbering the Forester should know more than a little about, as how to organize lumber operations, the equipment and management of logging and milling in various forest regions, the manufacture, seasoning, and grading of the rough and finished lumber, cost keeping in a lumber business, methods of sale, market requirements at home and abroad, prices, the relation of th
PREV.   NEXT  
|<   48   49   50   51   52   53   54   55   56   57   58   59   >>  



Top keywords:
methods
 

relation

 

forest

 

properties

 
seasoning
 
timber
 

moisture

 
lumber
 

structure

 

durability


importance

 

effect

 
important
 

content

 
density
 
microscope
 

student

 

shearing

 
compression
 

bending


requirements

 

torsion

 

keeping

 
tension
 

business

 
impact
 

hardness

 

market

 

structural

 

testing


prices

 

industries

 
dyeing
 

turpentine

 

industry

 

tanning

 
abroad
 
inform
 

standard

 

mechanical


physical

 

finished

 

grading

 

theory

 
commercial
 

preservation

 
equipment
 

effective

 
management
 

supply