. Annual report. Agricultural education. 1912.] PUBLIC DOCUMENT —No. 31. 113 the humidity is low the cracks show a tendency to open, and to close when the humidity is great. The rise and fall of the 95 90 85 90 ? 75 70 65 40-60* 50" Z(f KT 0* r 1 u 1„, m u u n ?u 1 n L / LTU L? n i ! u n u 35 50 25 20 15 10 5 0 J1 .1 r 1 Li i. ••MEAN REL. HUMIDITY -^EAN TEMP -BAROMETER •FROST CRACK 7 10 15 16 19 22 25 28 ^ A 7 10 13 16 .MAR. Showing curve of opening and closing of frost cracks in elm trees. The lower curve repre- sents the variations in the opening and closing
. Annual report. Agricultural education. 1912.] PUBLIC DOCUMENT —No. 31. 113 the humidity is low the cracks show a tendency to open, and to close when the humidity is great. The rise and fall of the 95 90 85 90 ? 75 70 65 40-60* 50" Z(f KT 0* r 1 u 1„, m u u n ?u 1 n L / LTU L? n i ! u n u 35 50 25 20 15 10 5 0 J1 .1 r 1 Li i. ••MEAN REL. HUMIDITY -^EAN TEMP -BAROMETER •FROST CRACK 7 10 15 16 19 22 25 28 ^ A 7 10 13 16 .MAR. Showing curve of opening and closing of frost cracks in elm trees. The lower curve repre- sents the variations in the opening and closing (scale, %4 of an inch); the others repre- sent the mean relative humidity, mean temperature and barometer in the order named. barometer curve coincides very closely with that of the frost cracks; in fact, there was such a close relationship between the temperature and barometer readings and opening and closing. 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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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherbostonsn, bookyear1
