. Compendium of meteorology. Meteorology. EXPERIMENTAL CLOUD FORMATION 1259 dilations produced in unstable layers. In this modi- fication the top of the chamber was a long glass plate, which could be moved across at any desired rate, being driven by a small electric motor. The top plate produces a shear, analogous to a wind varying with height. It was found that unless the excess of temperature at the base over that at the top was above the limiting value found in the investigation with the top at rest, no structure was observable in the smoke, no matter what the rate of shear. In all the expe
. Compendium of meteorology. Meteorology. EXPERIMENTAL CLOUD FORMATION 1259 dilations produced in unstable layers. In this modi- fication the top of the chamber was a long glass plate, which could be moved across at any desired rate, being driven by a small electric motor. The top plate produces a shear, analogous to a wind varying with height. It was found that unless the excess of temperature at the base over that at the top was above the limiting value found in the investigation with the top at rest, no structure was observable in the smoke, no matter what the rate of shear. In all the experiments with shear, care was therefore taken to ensure that the vertical gradient of temperature exceeded the limit appropriate to the depth of chamber. In the first experiments made in these conditions, the shear was given a high value. Figure 8 represents. Fig. 8.—The effect of shear, by motion from left of right of the top plate, in a chamber of depth 8 mm, with temperature difference of 58C. the flow pattern in a layer 8 mm in depth, with a temperature difference of 58C, and with the top plate moving at a rate of 10 cm sec~^ The chamber is filled by a set of double rolls, with descent at the common boundary of the two rolls in a pair, and ascent at the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Meteorological Society. Committee on the Compendium of Meteorology; Malone, Thomas F. Boston : American Meteorological Society
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