Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 596
upward currentof air, and the wind blows from the land. Thehotter the ascending column of air, the more rap- gfi nii • (:fl ■ • I 11 < -~pr III di&.pAW, Original type of barometer,mercury in a glass tube. A modern mercury buromete INSTRUMENTS FOR SHOWING THE WEIGHT OF AIR. The greater the… … INSTRUMENTS FOR INDICATING THE SPEED OF MOVING AIR.The wind makes the blades or cups revolve (as in a windmill) and the speed is marked on the dial as is time on a watch. 462 NATURE AND SCIENCE FOR YOUNG FOLKS [Mar., These huge ascending and descending columnsare many hundreds of miles in diameter,…
Children's literature
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