File:Boiling Point Apparatus or Hypsometer.jpg

English: Identifier: mapssurvey00hink

Title: Maps and survey Year: 1913 (1910s) Authors: Hinks, Arthur R. (Arthur Robert), 1873-1945 Subjects: Maps Surveying Publisher: Cambridge, University press Contributing Library: The Library of Congress Digitizing Sponsor: The Library of Congress

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Text Appearing Before Image: I. Aneroid Barometer.

Text Appearing After Image: 2. Boiling Point Apparatus or Hypsometer. Determinaiion of Heights. ROUTE TRAVERSING 75 It is not safe to assume that the sea level pressure is thesame at two places fifty miles apart. Therefore if one wishesto disentangle the weather changes from the altitude changes,it is almost necessary to have a barometer stationary in altitude,as nearly as possible below the barometer which is being carrieduphill. The weather changes of pressure are given by theformer and applied to the latter ; what is left of change maybe ascribed to the variation in height of the travelling baro-meter. In many cases it is not possible to leave a barometer at thebase camp, to be read while the travelling barometer is away.One must then do the best possible by returning to the basecamp as soon as possible after the ascent, and determining thechange in the reading there which has taken place during theday. Thus, suppose that a climber reads his barometer at 4 a.m.before setting out, and records frequent readings

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