. Trees and tree planting. Trees; Tree planting. 58 TREES AUD TEEE-PLAimNO. "motion of the ATJIOSPHEEE. " There is a marked contrast in the motion of a liquid like water, and an elastic, gaseous fluid Mke air. If we place an impediment in a creek the water immediately flows around the impediment, and will not flow over it as long as a clear way can be found to either the right or the left. But the air not only moves around on either side, but piles up in front of whatever checks its course and rolls over the top of the impediment as readily as it passes around. Thus a grove of timber
. Trees and tree planting. Trees; Tree planting. 58 TREES AUD TEEE-PLAimNO. "motion of the ATJIOSPHEEE. " There is a marked contrast in the motion of a liquid like water, and an elastic, gaseous fluid Mke air. If we place an impediment in a creek the water immediately flows around the impediment, and will not flow over it as long as a clear way can be found to either the right or the left. But the air not only moves around on either side, but piles up in front of whatever checks its course and rolls over the top of the impediment as readily as it passes around. Thus a grove of timber or a thin shelter- belt effectually checks the motion of the "â '^ii^s^^^^sa«ss=«awi:t^2SL'.'^"-'?I?-J^ The wind rises over the trees, as indicated by the ar- rows in the figure, and, instead of faUing like water to the ground, it flows on, as shown, and does not reach the original level until it has gone a distance of eleven times the height of the wind-breaks. There will be a quiet atmosphere immediately about the trees, but to eleven times the height of the shelter-belt, and even in the teeth of the wind at D, there wiU be a quiet atmosphere. It is well known that while the wiad may sweep with fearful velocity over a forest and powerfully agitate the tops of trees, the motion is comparatively sMght within the forest; the same is true of a succession of shelter-belts. The wind wiH sweep with great force over the trees at C, while aU below remains quiet. The extent of these quiet spaces, A and B, will of course depend upon the height of the shelter-belts. Any one who wiU take the. 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 Brisbin, James S. , (James Sanks), 1837-1892. New York, Harper
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Keywords: ., bookcentury1800, bookdecade1880, booksubjecttreepla, bookyear1888
