Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 108 heated, and as evapoi\ation takes place more rapidly at high than at low temperatures, southerly and southwesterly slopes lose most moisture from this cause. Fig. 45 shows how a surface Flfj. Jf5. inclined toward the south must receive more heat per square foot than either the level surface or the one inclined north- ward. If A65B is a section of a cylinder of sunshine falling upon the hill AEB, it is evident that A64E, the portion falling on the south slope, is greater
Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 108 heated, and as evapoi\ation takes place more rapidly at high than at low temperatures, southerly and southwesterly slopes lose most moisture from this cause. Fig. 45 shows how a surface Flfj. Jf5. inclined toward the south must receive more heat per square foot than either the level surface or the one inclined north- ward. If A65B is a section of a cylinder of sunshine falling upon the hill AEB, it is evident that A64E, the portion falling on the south slope, is greater than E45B, the portion falling on the north slope. It will also be evident that the 20-degree slope receives more heat than does the 5-degree slope, and this more than the level surface. The effect of the wind upon the evaporation from the soil is at its maximum at the summit of a hill, because at this place the wind velocity is greatest, no matter from what direction it may be blowing. 171. Effect of Woodlands on Evaporation.— A piece of woodland which lies to the southwest and west of a held exerts a considerable effect upon the humidity of the air which traverses that field, the tendency being to make the air more moist. Taking a specific illustration, the air on the leeward side of a second growth black-oak grove was found, on one occasion, to contain per cent, more moisture than did that on the windward side at the same time; and again, when the wind was in the opposite direction, observations in the same locahties showed per cent, more moisture on the leeward side, the observations in the four cases being taken about 10 rods from the margin of the grove. There was observed at
Size: 1780px × 1124px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
