Smithsonian Miscellaneous Collections, Volume 69,Numéro 1

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Smithsonian Institution., 1913
 

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Page 226 - Bather large globular masses, white or grayish, partially shaded, arranged in groups or lines, and often so closely packed that their edges appear confused.
Page 226 - Cirro-nebula) at other times presenting, more or less distinctly, a formation like a tangled web.
Page 227 - Woolpack Clouds — Thick clouds of which the upper surface is dome-shaped and exhibits protuberances, while the base is horizontal. These clouds appear to be formed by a diurnal ascensional movement which is almost always observable. When the cloud is opposite the sun, the surfaces usually presented to the observer have a greater brilliance than the margins of the protuberances.
Page 227 - Heavy masses of cloud rising in the form of mountains, turrets, or anvils, generally surmounted by a sheet or screen of fibrous appearance (false cirrus) and having at its base a mass of cloud • V.
Page 227 - ... 10. Stratus (St.). — A uniform layer of cloud resembling a fog but not resting on the ground. When this sheet is broken up into irregular shreds in a wind, or by the summits of mountains, it may be distinguished by the name Fracto-strattis (Fr.-St.).
Page 226 - St.-Cu. presents the appearance of a gray layer irregularly broken up into masses of which the edge is often formed of smaller masses, often of wavy appearance resembling A.-Cu. Sometimes this cloud-form presents the characteristic appearance of great rolls arranged in parallel lines and pressed close up against one another. In their centers these rolls are of a dark color. Blue sky may be seen through the intervening spaces which are of a much lighter color.
Page 227 - Sometimes the upper edges assume the compact form of cumulus, and form massive peaks round which delicate "false cirrus" floats. At other times the edges themselves separate into a fringe of filaments similar to cirrus clouds. This last form is particularly common in spring showers. The front of thunderclouds of wide extent frequently presents the form of a large arc spread over a portion of a uniformly brighter sky.
Page 226 - Rain clouds; a thick layer of dark clouds, without shape and with ragged edges, from which continued rain or snow generally falls.
Page 227 - True cumulus has well-defined upper and lower limits, but in strong winds a broken cloud resembling cumulus is often seen in which the detached portions undergo continual change. This form may be distinguished by the name Fracto-cumulus (Fr.-Cu).

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