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Updated: June 9, 2025
These observations, and those of the barometer, were taken 60 feet below the summit, to which I moved the instruments on the morning of the 23rd. My barometrical observations, taken simultaneously with those of Calcutta, give the height of Tonglo, 10,078.3 feet; Colonel Waugh's, by trigonometry, 10,079.4 feet, a remarkable and unusual coincidence. May 23.
Oltmann is called to his aid to revise his astronomical observations, and his barometrical measurements by which he has determined the geographical position of seven hundred different points and the altitude of more than four hundred and fifty of them.
Favored beyond our expectations, all our registers had been recovered, with the exception of one of my journals, which contained the notes and incidents of travel, and topographical descriptions, a number of scattered astronomical observations, principally meridian altitudes of the sun, and our barometrical register west of Laramie.
We had also measured the refraction of different gases, which, up to that time, had not been attempted. A determination, more exact than had been previously obtained, of the relation of the weight of air to the weight of mercury, had furnished a direct value of the coefficient of the barometrical formula which served for the calculation of the heights.
Kennedy's barometrical observations, upwards of two thousand feet above the level of the sea. We also discovered a great many snails, with very large shells of a greyish colour. One I found on the bushes with an operculum this I gave to Wall. August 10. This morning we took the sheep and horses to a spot in the river where the current was not so strong, and drove them across.
Fortunately, our other journals contained duplicates of the most important barometrical observations. In addition to these, we saved the circle; and these, with a few blankets, constituted every thing that had been rescued from the waters. A young girl has been captured at her father's hut, when all the males of the household are absent hunting wolves.
By barometrical measurements taken by the engineer officers of the army at different times, the height of Bent's Fort above the ocean level is approximately eight thousand nine hundred and fifty-eight feet, and the fall of the Arkansas River from the fort to the great bend of that stream, about three hundred and eleven miles east, is seven feet and four-tenths per mile.
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