. Annual report. Agricultural education. 1912.] PUBLIC DOCUMENT —No. 31. 169 obtained in Table L, the curve being based on daily readings on the north, south, east and west sides of the tree. All of these figures show that there exists a marked relationship between the temperature curve and that for the electrical resistance, since as the temperature curve goes up the resistance curve goes down. 58°F. 6 7 89 /Oil U 13 14 15 16 17 18 19 ZOll APR. Fig. 1. — Showing curve of electrical resistance and temperature of elm, Ulmus Americana (Table II.). The lower curve gives the average resistance of
. Annual report. Agricultural education. 1912.] PUBLIC DOCUMENT —No. 31. 169 obtained in Table L, the curve being based on daily readings on the north, south, east and west sides of the tree. All of these figures show that there exists a marked relationship between the temperature curve and that for the electrical resistance, since as the temperature curve goes up the resistance curve goes down. 58°F. 6 7 89 /Oil U 13 14 15 16 17 18 19 ZOll APR. Fig. 1. — Showing curve of electrical resistance and temperature of elm, Ulmus Americana (Table II.). The lower curve gives the average resistance of the north, south, east and west sides of the tree from April 6 to 26; the upper curve gives the mean of the minimum and max- imum temperature for the same period obtained from the local meteorological station. In Fig. 3 is shown the hourly temperature and electrical resistance of the north side of a maple tree for a single day, the data being obtained from Table IX. In both Tigs. 1 and 2 the temperature is taken from mean temperature records, while in the case of Fig. 3 they correspond with the hours of 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 Massachusetts Agricultural College; Massachusetts Agricultural Experiment Station; Massachusetts Agricultural Experiment Station. Annual report of the Hatch Experiment Station of the Massachusetts Agricultural College. Boston : [s. n. ]
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