. Nature . trumentsent up from that stationon that day has not beenfound. Distances measured ver-tically along the glasssides of the models repre-sent heights above sea-level on the scale of 5miles to 4 inches. Tlievertical scale of the modelis therefore twenty timesthe horizontal scale of th%map. The total height represented is 24 kilometres (15miles). The observations from each station are plotted on theedge? of the models. Isotherms (full lines) are drawn on NO. 2124, VOL. 84] the glass sides for every 5° C, the temperature being ex-pressed in absolute measure. The space between theisotherm
. Nature . trumentsent up from that stationon that day has not beenfound. Distances measured ver-tically along the glasssides of the models repre-sent heights above sea-level on the scale of 5miles to 4 inches. Tlievertical scale of the modelis therefore twenty timesthe horizontal scale of th%map. The total height represented is 24 kilometres (15miles). The observations from each station are plotted on theedge? of the models. Isotherms (full lines) are drawn on NO. 2124, VOL. 84] the glass sides for every 5° C, the temperature being ex-pressed in absolute measure. The space between theisotherms of 270° and 275° is filled in to indicate the posi-tion of the freezing point. Both models show clearlv the two main divisions of the July :?7, 190S. Block seen from thepace between the isotherms oovered. The beaded lines in t1 the standards face the wind i n. Isotherms are shown for each 5d 275 is tilled in ; for other isothermsphere are isobars for 02 megabar andined by observations with ,-en on from 285° A. to 205° A. Thea thickness corresponding with i° C. isol megabar respectively. The arrows ( Isotherms are shown for each 5of 270° and 273° is filled in ; for other isothermsovered. The beaded lines in the stratosphere are isobars for o;2 megabar and1 the standards face the wind as determined by observations with theodolites. atmosphere, viz. :—(i) troposphere, or lower portion, inwhich temperature diminishes with height at a nearlyuniform rate and the isothermal surfaces are approxi-mately horizontal, and (2) isothermal region, or 6o NATURE [July 14, 1910 stratosphere, above the troposphere, in which tempera-ture is nearly constant or increases slowly with height, andthfl isothermal planes tend to become vertical. Isobars for one-tenth and one-fifth of an atmosphere(o-i megabar and o-2 megabar according to the nomen-clature of the Paris Conference of Physicists, 1900) areshown by beaded lines in the upper parts of the figures. Wind-d
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