. Augustana Library publications. Scandinavians. 54 ATMOSPHERIC DUST. Tahle XXXV. Mechanical Composition of Sliower Dust fallen at Rock Island, ill., February, 1896. of diameter ill mm. 16—8 8-4 4—2 2—1 1—^ 1 1 1 1 1 _ J 64 1 _ TITS Prom snow in timber. From snow just above tbft river From snow near a ravine. From snow close to a tree. tr. > 4( ^ Table XXXV (Continued). 156 From snnw on an open field. Average. tr. • .4 I 4 42 44 Over level areas, as out on the ice of the river awav from the banks, and on an open field, a g-reater pr
. Augustana Library publications. Scandinavians. 54 ATMOSPHERIC DUST. Tahle XXXV. Mechanical Composition of Sliower Dust fallen at Rock Island, ill., February, 1896. of diameter ill mm. 16—8 8-4 4—2 2—1 1—^ 1 1 1 1 1 _ J 64 1 _ TITS Prom snow in timber. From snow just above tbft river From snow near a ravine. From snow close to a tree. tr. > 4( ^ Table XXXV (Continued). 156 From snnw on an open field. Average. tr. • .4 I 4 42 44 Over level areas, as out on the ice of the river awav from the banks, and on an open field, a g-reater proportion of fine dnst is notice- able (Xos. 146, 150 156). due most likelv to a more even pro- gression of the atmosphere per- mitting more of its load to settle, while near places where timber or topographic contours liad set u]) convection currents, less of the .finer dust seems to have been able to comedown (Xos. 144,152, 153). In the averages from each of these three showers the me-. 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 Augustana College and Theological Seminary (Rock Island, Ill. ); Augustana College (Rock Island, Ill. ). Library. Rock Island, Ill. : Augustana College and Theological Seminary
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