. Practical text-book of plant physiology. Plant physiology. MEASUREMENT OF GROWTH 289 of a small bit of ignited camphor until the paper is covered with an even layer of soot. Adjust in place again and set the clockwork in action, so that the cylinder will be given a partial turn every hour. The growth of the organ will allow the short arm of the lever to rise a distance equal to the amount of elongation, and the long arm to fall six times this amount, if that proportion has been established between the two arms of the lever. The gradual descent of the lever will trace a straight line in the s
. Practical text-book of plant physiology. Plant physiology. MEASUREMENT OF GROWTH 289 of a small bit of ignited camphor until the paper is covered with an even layer of soot. Adjust in place again and set the clockwork in action, so that the cylinder will be given a partial turn every hour. The growth of the organ will allow the short arm of the lever to rise a distance equal to the amount of elongation, and the long arm to fall six times this amount, if that proportion has been established between the two arms of the lever. The gradual descent of the lever will trace a straight line in the soot on the paper showing the multiplied growth during the hour: at the end of that period the clock releases a clutch. XT Fig. 138. Thermograph. and allows a weight to turn the cylinder a short distance during which movement the point of the lever traces a straight horizontal line. The process is repeated every hour and when the lever has reached the lower end of the cylinder it will have made a line resembling the section of a set of stair steps, of which the vertical lines represent multiplied growth, and the horizontal lines the hours. Shorten the thread and thus raise the tip of the lever to its former level and allow it to trace another line : repeat in such manner as to secure a record for several days if possible. Set a thermograph near the instrument and secure a continuous record of the temperature 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. New York [etc. ] Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantph, bookyear1901
