. Cyclopedia of farm crops. Farm produce; Agriculture. FORESTS FORESTS 335 and ab equals 20; then AB by ab equals 1800; divided by AC, supposed to equal 22, it gives nearly 82 feet as the height of the tree, or DE in the diagram. In practice, a gang of four men is frequently engaged in making the survey. A half chain of thirty-three feet is fastened to the belt of the chain-man, who is guided by a man with a compass in order to make as straight a line as possible through the woods. A man on either side of the chain-man calipers the trees for a lateral distance of thirty-three feet, and calls o
. Cyclopedia of farm crops. Farm produce; Agriculture. FORESTS FORESTS 335 and ab equals 20; then AB by ab equals 1800; divided by AC, supposed to equal 22, it gives nearly 82 feet as the height of the tree, or DE in the diagram. In practice, a gang of four men is frequently engaged in making the survey. A half chain of thirty-three feet is fastened to the belt of the chain-man, who is guided by a man with a compass in order to make as straight a line as possible through the woods. A man on either side of the chain-man calipers the trees for a lateral distance of thirty-three feet, and calls out the result to the chain-man, who makes record of it on a sheet especially prepared for the purpose. The chain-man also makes note of the direction and size of streams, of hills and of inclines that may be of interest or use in the harvest. The gang 'proceeds for twenty half chains, when an acre has been covered. The measured acres are tqual distances apart to the right and left of a base line through the tract. Sometimes circular areas of such radii as to contain a certain fraction or a whole acre, considered to be an average of the whole stand, are measured. The volume is by multiplying the area of the base of the tree at stump height by one-half the height. Each cubic foot of saw tim- ber will cut out five to seven board feet. About eighty-five cubic feet of wood will pile up a stand- ard cord of 4x4x8 feet, or about thirty solid cubic feet will pile up a cord of sixteen-inch wood. As a further means of determining the most prof- itable procedure, stem analyses are made by de- termining the increase through decades by measur- ing the thickness of each ten annual rings, begin- ning at the bark. By deducting from the present volume that at any year previous, the increment during that period is obtained. From the average increment of a suificiently large number of trees, a reasonably accurate account of what the whole area has been doing can be given and a worki
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