. Carnegie Institution of Washington publication. GROWTH IN TREES. 13 ram does not enter the case. A circular table or base is fitted to the cap, and a drum made of a pection of large brass pipe sits directly on this fitting inside its raised rim, so that it may be removed without dis- turbance of the clockwork. The new feature of importance of this cylinder is the manner in which the record paper is attached. The paper is 80 mm. in width and. FIG. 2.—Improved dendrograph lever set. A, inner end of quarta rod in contact with prepared surface on the bark of the tree. The outer end of the quartz
. Carnegie Institution of Washington publication. GROWTH IN TREES. 13 ram does not enter the case. A circular table or base is fitted to the cap, and a drum made of a pection of large brass pipe sits directly on this fitting inside its raised rim, so that it may be removed without dis- turbance of the clockwork. The new feature of importance of this cylinder is the manner in which the record paper is attached. The paper is 80 mm. in width and. FIG. 2.—Improved dendrograph lever set. A, inner end of quarta rod in contact with prepared surface on the bark of the tree. The outer end of the quartz rod is fitted with a metal guide which engages the short arm of the recording lever at B. The long arm of the recording lever, D, carries a pen which makes a tracing on ruled paper on a revolving drum. The horizontal member of the frame C, which carries the recording lever, may be toward or away from the tree to adjust the pen at any point on the paper record sheet. ruled to millimeters. When placed on the drum the ends are thrust through a slot 1 mm. in width and the free ends are creased on the inside without further fastening. When the drum with the paper so attached is set on its circular base the paper is properly in position when its lower edge is in contact with the rim of the base. A covering as described below is placed over the recorder, but in any case actual rain falling on it would mar only the record and could not damage the instrument. The floating frame, however, is exposed to all features of the weather and to the effects of sunlight which might cause its temperature to vary from about 0° C. to 25° C. during the growing season of the trees. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
Size: 1826px × 1368px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1902
