Science for beginners . hat followed in using TableV. This correction, however, is added to the barometer reading. Note.—Extensive tables for the correction of barometers for anyaltitude from the sea level up to several thousand feet have beenprepared. It is intended that the teacher or student wishing to usethis book at an altitude not given in this table shall ascertain thecorrections necessary at the required altitude and the various tem-peratures by applying to some nearby weather station, and recordthem on the line marked X. 144 THE WEATHER The corrected barometer readings everywhere in t
Science for beginners . hat followed in using TableV. This correction, however, is added to the barometer reading. Note.—Extensive tables for the correction of barometers for anyaltitude from the sea level up to several thousand feet have beenprepared. It is intended that the teacher or student wishing to usethis book at an altitude not given in this table shall ascertain thecorrections necessary at the required altitude and the various tem-peratures by applying to some nearby weather station, and recordthem on the line marked X. 144 THE WEATHER The corrected barometer readings everywhere in the UnitedStates will be exactly alike unless the actual pressure of theatmosphere differs in different places. We cannot see or feeldifferences in pressure as we do the differences in cloudinessor temperature or wind. But these differences in pressurecause most of the weather changes that occur. And if wewrite all the corrected barometer readings in their properplaces on a map of the United States, we can see from the. Fig. 106.—The barograph. map where storms are developing and where the weatherwill remain fair. This enables the Weather Bureau to makeforecasts of coming weather. Barometers, used in that way,are the most important of weather • 156. The Barograph.—The barograph writes a continuousrecord of the barometer readings. The record paper iswrapped around a brass cylinder* that is turned by an eight-day clock. The barometer portion consists of a series of sixor eight hollow elastic shells shaped like a canteen or twosaucers turned top to top (Fig. 106). These shells are madeof corrugated metal, soldered together one above the other, andthe air has been exhausted from them. The atmospheric 1 In addition to the pressure of the air, fully equipped Aveather sta-tions record the temperature, the rainfall and snowfall, the directionand force of the wind, the duration of sunshine and cloudiness, theamount of moisture in the air, and a number of other condi
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscience, bookyear1921
