Smithsonian miscellaneous collections . d m/ forms the angle (^ — y) with theaxis 0 X. Considering the cy-clone of §32, we have = 480,Ul — 3m, m = 150. Assuming/ = 1 and d = 6o°, we shall have(/> — x = — 12°, which signi-fies that the perpendicular c and the diameter d are below the axisO X. Substituting i = , , etc.,we shall find the curves of , in which a b represents the direction of the isotherms. FIG. 46. Co FIG. 47 232 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 51 Chapter VIII SYSTEMS OF WIND IN NATURE §34. Influence of the surface of the earth In nature the systems
Smithsonian miscellaneous collections . d m/ forms the angle (^ — y) with theaxis 0 X. Considering the cy-clone of §32, we have = 480,Ul — 3m, m = 150. Assuming/ = 1 and d = 6o°, we shall have(/> — x = — 12°, which signi-fies that the perpendicular c and the diameter d are below the axisO X. Substituting i = , , etc.,we shall find the curves of , in which a b represents the direction of the isotherms. FIG. 46. Co FIG. 47 232 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 51 Chapter VIII SYSTEMS OF WIND IN NATURE §34. Influence of the surface of the earth In nature the systems of wind show many deviations from theideal systems that we have considered. It is especially the sur-face of the earth with its irregularities that produces the greatestdisturbances. To take an extreme case, let us consider a valley,that is to say an uncovered channel in the crust of the earth, it isevident that the wind follows the direction of the channel, whatevermay be the direction of the gradient in the strata above the vallej^. At meteorological stations situated at the surface of theearth, we must expect that the angle which is determined by observations. We believethat th
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