. Report upon the forestry investigations of the U. S. Department of agriculture. 1877-1898. Forests and forestry. 386 FORESTRY INVESTIGATIONS U. R. DEPARTMENT OF AGRICULTURE. Some of the disks were split to a wedge shape from center to periphery, so that each smaller piece not only represents a certain period of growth in quality, but also in quantity, thus simplify- ing the calculations for the entire piece or disk. Other pieces were left in their prismatic form, when to calculate the average density of the entire piece the density of each smaller piece is multiplied by the mean distance of
. Report upon the forestry investigations of the U. S. Department of agriculture. 1877-1898. Forests and forestry. 386 FORESTRY INVESTIGATIONS U. R. DEPARTMENT OF AGRICULTURE. Some of the disks were split to a wedge shape from center to periphery, so that each smaller piece not only represents a certain period of growth in quality, but also in quantity, thus simplify- ing the calculations for the entire piece or disk. Other pieces were left in their prismatic form, when to calculate the average density of the entire piece the density of each smaller piece is multiplied by the mean distance of this smaller piece from the center, and the sum of the products divided by the sum of the distances. Bach piece is marked, first by the number of the tree, in Arabic; second, by the number of the disk, in Roman numbers; and if split into small pieces, each smaller piece by a letter of the alphabet, the piece at the periphery in all cases bearing the letter a. Besides the number and letters mentioned, each piece bears either the letter "S or S, to indicate its orientation on the north or south side of the tree. To illustrate: 5—vn N a means that the piece bearing the label belongs to tree 5 and disk vn comes from the north side of the tree, and is the peripheral part of this disk piece. From the collector's notes the exact position of this piece in the tree can readily be ascertained. The entire prisms sent by freight are left in the original form, unless used for special purposes, and are stored in a dry room for future use. WEIGHING AND MEASURING The weighing is done on an apothecary's balance, readily sensitive to gram with a load of more than 200 grams. Dealing with pieces of 200 to 1,000 grams in weight, the accuracy of weigh- ing is always within 1 gram. The measuring is done by immersion in an instrument illustrated in the following design: Vis a vessel of iron; 8 represents one of two iron standards attached to the vessel and projecting. B !, S s ^cSl ) i —
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectforestsandforestry
