. Augustana Library publications. Scandinavians. ATMOSPHERIC DUST. 43 was made of each catch. The maximum velocities of the wind for each day ranged from nine to twenty miles. In this case also there was a correspondence be- tween the wind velocities and the quantities of the dust caught, but on examining the analyses, it it seen that the coarse admixtures rather decrease than increase with the speed of the wind. The fine ingredients are quite as Table XXVIf. Mechanical Composition of Dust collected directly from the Atmosphere by means of Muslin, smeared with Glycerine, July, Aug. Sep
. Augustana Library publications. Scandinavians. ATMOSPHERIC DUST. 43 was made of each catch. The maximum velocities of the wind for each day ranged from nine to twenty miles. In this case also there was a correspondence be- tween the wind velocities and the quantities of the dust caught, but on examining the analyses, it it seen that the coarse admixtures rather decrease than increase with the speed of the wind. The fine ingredients are quite as Table XXVIf. Mechanical Composition of Dust collected directly from the Atmosphere by means of Muslin, smeared with Glycerine, July, Aug. Sept., 1895. Lengtli of diameter in mm. From the flagpole during June and July, 1896. Under trees in a grove. rop cloth on flag- pole, Aug, 19, 1895. Bottom cloth on flag pole, Aug, 19, 1896. Average, 16-8 8-4 4—2 2-1 1 1 10 1 _ 1^8 1 (i . 1 aw . 1_ r2"8 _ 1 tr. I. well represented for the daj^s with high winds as for days with low winds (Tab. XXVI). Some dust was collected at the same place and at the same height by suspending two jiieces of muslin held horizontally on a frame. The muslin was smeared with glycerine, to which the dust adhered. This Avas secured by washing and allowed to settle as before. One sam]jle. 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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