. Growth in trees. Growth (Plants); Trees. 10 GROWTH IN TREES. The second and preferable form of base may be described in a phrase as a belt of wooden blocks hinged together. Seasoned and oiled blocks of redwood (Sequoia sempervirens), 15 by 7 by 7 cm., were bound together in a belt by pairs of galvanized strips of u'on. Small bolts passed through the ends of these strips and through holes near. Fig. 1.—Earlier form of dendrograph with which all records previous to September 1920 were made. This instrument takes a bearing from a prepared area on the bark of the tree by one end of a small lever
. Growth in trees. Growth (Plants); Trees. 10 GROWTH IN TREES. The second and preferable form of base may be described in a phrase as a belt of wooden blocks hinged together. Seasoned and oiled blocks of redwood (Sequoia sempervirens), 15 by 7 by 7 cm., were bound together in a belt by pairs of galvanized strips of u'on. Small bolts passed through the ends of these strips and through holes near. Fig. 1.—Earlier form of dendrograph with which all records previous to September 1920 were made. This instrument takes a bearing from a prepared area on the bark of the tree by one end of a small lever, the other end of which is connected with the short arm of a recording lever. The improved instrument includes a lever set, in which the bearing on the tree is made by a hori- zontally moving quartz rod, as shown in fig. 2. An encircling belt of wooden blocks serves as a base and support. Flexible wire standards, with a base of thin sheet metal, are clamped in position on the wooden blocks, and screw clamps which slide up and down on the wire standards Berve to hold the floating frame in a horizontal position. The entire apparatus is so adjusted that a contact rod on the opposite side of the tree is held witji gentle pressure against the tree and any variation in diameter is then expressed by movements in the lever Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original MacDougal, Daniel Trembly, 1865-1958. Washington, Carnegie Institution of Washington
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Keywords: ., bookauthormacdouga, bookcentury1900, bookdecade1920, bookyear1921
