Identifier: scienceforbeginn00barb (find matches)
Title: Science for beginners
Year: 1921 (1920s)
Authors: Barber, Frederic Delos, 1868- Fuller, Merton Leonard, 1872- joint author Pricer, John Lossen, 1871-1920, joint author Adams, Howard William, 1875- joint author
Subjects: Science
Publisher: New York, H. Holt and Company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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direction. The thickening of cirrus into cirro-stratus, as shown here,often indicates rain or snow. The clouds seem to thicken graduallyuntil the sky is hidden. This thickening is sometimes partly due tothe growth of the clouds themselves; usually it is caused mainly by thecoming of denser masses as the earlier clouds pass on. ; • ■ . -. ■ ■ ■ .... ,,:.. .. . Fig. 126.—Fair-weather cumulus clouds. This type of cumulus isoften seen. Note the level bases and rounded tops. (The bases are allat the same height, though the distant bases appear lower becausefarther away.) These clouds do not indicate rain. 170 MARES TAIL CIRRUS 27000 to50.000/t CIRRO-STRATUS AVERAGE 29500ftMACKEREL SKY CIRRO-CUMULUS 10.000 to 23000ft. ALTOCUMULUS 10.000 to 23000ft. ALTO-STRATUS 10.000 to 23 000 ft. STRATO-CUMULUS ABOUT 6500ft. CUMULUS 4500 to5000ft STORM CLOUD CUMULONIMBUS 4500 to 24000ft. THE WEATHER TYPICAL FORMS. HEIGHT, COMPARISON,OBJECTS RAIN CLOUD NIMBUS 3000 to 640Oft STRATUS O to 3500 ft
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Fig. 127.—Cloud forms, in order of their elevation.(Note. These classes and heights should be learned.) THE WATER VAPOR OF THE AIR 171 Cl-asses of Clouds.—Description Principal Types i. Cirrus.—Whitish color. Makes no shadow. Is made up of threadsor fibers that are sometimes arranged like a feather and sometimeswoven like cloth. Sometimes these fibers are straight; sometimes curved.Cirrus clouds often move very fast, but do not seem to do so becausethey are so high. They average about 5 to 7 miles above sea level. 2. Cumulus.—The rounded heap cloud. Seen oftenest in summer. Isdark on shaded side and bright on sunny side. Casts a shadow on theground. Cumulus range from very small to as large as a mountain.Their bottoms are usually flat, and may be *4 uiile to 1 mile high, whilethe tops are sometimes 3 or 4 miles higher. 3. Stratus.—A flat, sheet-like cloud; color dark gray. It may coverall the sky like a blanket, or it may be broken into patches. It mayhave either clear sky o

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