Instructions to observers of the Indian Meteorological Department

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Office of the Superintendent of Government printing, India, 1902 - Science - 120 pages

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Page 86 - This last form is particularly common in spring showers. The front of thunder-clouds of wide extent frequently presents the form of a large bow spread over a portion of the sky, which is uniformly brighter in color.
Page 85 - St.-Cu.) at the center of the group, but the thickness of the layer varies. At times the masses spread themselves out and assume the appearance of small waves or thin slightly curved plates. At the margin they form into finer flakes (resembling Ci.-Cu.) They often spread themselves out in lines in one or two directions.
Page 85 - Rain Clouds. A thick layer of dark clouds without shape and with ragged edges, from which steady rain or snow usually falls.
Page 84 - Cirro-nebula) at other times presenting, more or less distinctly, a formation like a tangled web.
Page 85 - Rain clouds; a thick layer of dark clouds, without shape and with ragged edges, from which continued rain or snow generally falls.
Page 85 - From the base there usually fall local showers of rain or of snow (occasionally hail or soft hail). Sometimes the upper edges have the compact form of Cumulus, forming into massive peaks, round which the delicate "false Cirrus" floats, and sometimes the edges themselves separate into a fringe of filaments similar to that of the Cirrus cloud. This last form is particularly common in spring showers. The front of...
Page 85 - CLOUDS. — Thick clouds of which the upper surface is domeshaped and exhibits protuberances while the base is horizontal. These clouds appear to be formed by a diurnal ascensional movement which is almost always noticeable. When the cloud is opposite the sun, the surfaces facing the observer have a greater brilliance than the margins of the protuberances. When the light falls aslant, as is usually the case, these clouds throw deep shadows; when, on the contrary, the clouds are on the same side of...
Page 88 - Set up a pointed pole, reaching 6 or 8 feet above the observer's head, and through the top, an inch or so below the point, fix two stout cross-wires, or thin iron rods, set truly by compass to the four cardinal points. The space around the pole must be sufficiently open to allow of a good view of the sky in all directions. Let the observer then station himself at such a distance from the pole, and in such a position that some recognizable limb of a cloud appears to move vertically upward from the...
Page 84 - Detached clouds, delicate and fibrous looking, taking the form of feathers, generally of a white colour, sometimes arranged in belts which cross a portion of the sky in "great circles", and by an effect of perspective, converge towards one or two opposite points of the horizon (the C.-S.
Page 85 - ... appear dark, with bright edges. The true Cumulus has clear superior and inferior limits. It is often broken up by strong winds, and the detached portions undergo continual changes. These may be distinguished by the name of Fracto-Cumulua (Fr.-Cu.).

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