. Research methods in ecology. Plant ecology. Fig. 28. Combined clinometer and compass. 123. The trechometer. For measuring the effect of slope upon run-off, a simple instrument called the trechometer (rpi-xu), to run off) has been devised. This consists merely of a metal tank, 3 x 4 x 12 inches, hold- ing 144 square inches of water, with an opening J4 x 12 inches at the base in front, closed by a tight-fitting slide. Three metal strips, 2 x 12 inches, are fastened to the front of the tank in such a way as to enclose a square foot of soil into which the strips penetrate an inch. In the front s
. Research methods in ecology. Plant ecology. Fig. 28. Combined clinometer and compass. 123. The trechometer. For measuring the effect of slope upon run-off, a simple instrument called the trechometer (rpi-xu), to run off) has been devised. This consists merely of a metal tank, 3 x 4 x 12 inches, hold- ing 144 square inches of water, with an opening J4 x 12 inches at the base in front, closed by a tight-fitting slide. Three metal strips, 2 x 12 inches, are fastened to the front of the tank in such a way as to enclose a square foot of soil into which the strips penetrate an inch. In the front strip is an opening, i inch square, provided with a drip from which the run-off is collected in-a measuring vessel. In use, the instrument is put in position with the metal rim forced down i inch into the soil; the tank is filled, the graduate put in place, and the slide raised. The run-off for a square foot is the amount of water caught by the graduate, and is represented in cubic inches per square foot. For obtaining results which express slope alone, comparisons must be made upon the same soil, from which all cover, dead and living, has been removed. They must be as closely together in time as possible, at least during the same day, as rain or evaporation will. 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 Clements, Frederic E. (Frederic Edward), 1874-1945. Lincoln, Neb. , University Pub. Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantec, bookyear1905
