. Travels amongst the great Andes of the equator . hungin the manner shewn in the diagram, barometers have little tend-ency to swing to and fro. No shock that is likely to occur will 56 TRAVELS AMONGST THE GREAT ANDES, chap. hi. make the cisterns move from M to N—though, if they did so,tin stands would not he overturned. The actual method of suspension at A, Fig. 2, isa device of my own, and isshewn in the accompanyingengraving, which rendersdescription unnecessary. Toset out a theodolite standand hang a barometer inposition upon this catch isan affair of a few if the ordinary st
. Travels amongst the great Andes of the equator . hungin the manner shewn in the diagram, barometers have little tend-ency to swing to and fro. No shock that is likely to occur will 56 TRAVELS AMONGST THE GREAT ANDES, chap. hi. make the cisterns move from M to N—though, if they did so,tin stands would not he overturned. The actual method of suspension at A, Fig. 2, isa device of my own, and isshewn in the accompanyingengraving, which rendersdescription unnecessary. Toset out a theodolite standand hang a barometer inposition upon this catch isan affair of a few if the ordinary standis employed minutes areoccupied in the operation. The mercurial barometerread IG476 inches at on Dec. 28, 16488inches on the 29th, and1G-480 on the 30th. , at Guayaquil,made simultaneous obser-vations on the 28th and 29th, and found no change in pressureon the latter day. But while the mercurials were demonstratingthe remarkable stability of the barometer in Ecuador the aneroidsshowed lower pressures on each successive Place ofObservation. Second CampGuayaquilSecond CampDo. Do. Barometer. Merc. Bar. No. 558 (corrected) do. No. 554 ( do. Means of six AneroidsErrors of means of AneroidsAneroid F . . Error of Aneroid F . Dec. 28, Dec. 29 Dec. 30, 1879. 1879. 1870. 11 11 11 inches. inches. inches. ) 10-476 10-488 10-480 ) 20-910 29010 . 15*643 15-611 15-577 . -0-833 -0-877 -0 903 . 15-300 15-280 . -1-170 -1-188 -1-200 chap. m. CONFLICTING STATEMENTS. 57 At the last reference to Aneroid F (p. 38) its error amountedto —1*080 of an inch. At the first camp on Ohimborazo it wasincreased to ?—1*152 of an inch, and from the above record it willbe seen that it still augmented daily. Thus, while the mercurial barometer shewed a slight increasein pressure, the whole of the aneroids, on the other hand, indicatedpressure If I had depended upon the latter instru-ments, atmospheric pressure in Ecuador, instead of appearing, asi
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