CircularU.S. Government Printing Office, 1932 |
Autres éditions - Tout afficher
Expressions et termes fréquents
accurate airport stations airways observer airways station alidade altitudes anemometer aneroid barometer angle axis barometric pressure base line binding posts BRKN CLDS broken clouds ceiling balloons ceiling height ceiling-light projectors circuit clinometer contact spring Cumulo-nimbus Dense fog dense ground fog dew point direction and velocity distance dry bulb element equipped feet field conditions Field soft field wet FIGURE fog is present freezing rain frozen deep hazy height of ceiling hydrogen inches inflated installation instructions instrument lamp layer light spot measure miles observation point obstructions to vision obtained occurring overcast pilot pipe supports precipitation psychrometer rain or snow readings reported as unlimited RHEOSTAT roof Scattered clouds screwed SCTD CLDS Section shelter smoke tables teletype temperature theodolite thermometer thick haze thirty zero thunderstorm tions tower twenty nine usually velocity indicator vertical visibility Weather Bureau wet bulb wind direction wind instruments wind vane wire
Fréquemment cités
Page 26 - Direction of wind shown by smoke drift, but not by wind vanes. Wind felt on face; leaves rustle; ordinary vane moved by wind.
Page 26 - ... light flag. Raises dust and loose paper; small branches are moved Small trees in leaf begin to sway; crested wavelets form on inland waters. Large branches in motion; whistling heard in telegraph wires; umbrellas used with difficulty. Whole trees in motion; inconvenience felt when walking against wind. Breaks twigs off trees; generally impedes progress.
Page 4 - 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 similar to nimbus. From the base local showers of rain or snow (occasionally of hail or soft hail) usually fall. Sometimes the upper edges assume the compact form of cumulus, and form massive peaks round which delicate "false cirrus
Page 3 - A thick sheet of a gray or bluish color, sometimes forming a compact mass of dark gray color and fibrous structure. At other times the sheet is thin, resembling thick Ci.-St., and through it the Sun or the Moon may be seen dimly gleaming as through ground glass.
Page 3 - Largish globular masses, white or grayish, partially shaded, arranged in groups or lines, and often so closely packed that their edges appear confused. The detached masses are generally larger and more compact (resembling 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...
Page 3 - Cirro-stratus (Ci.-St.). A thin, whitish sheet of clouds sometimes covering the sky completely and giving it only a milky appearance (it is then called Cirro-nebula) at other times presenting, more or less distinctly, a formation like a tangled web. This sheet often produces halos around the sun and moon.
Page 3 - Cirrus uncinus, etc.; they are sometimes arranged in parallel belts which cross a portion of the sky in a great circle, and by an effect of perspective appear to converge toward a point on the horizon, or, if sufficiently extended, toward the opposite point also.
Page 4 - Rain Clouds. A thick layer of dark clouds without shape and with ragged edges, from which steady rain or snow usually falls.
Page 4 - ... 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 4 - Nb.), ("Scud" of sailors). 8. Cumulus (Си.), Wool-pack 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 noticeable.