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Updated: June 9, 2025
Cunningham has lost sight of, or overlooked the fact, that the fall of its bed in the first two hundred miles, is more than 2800 feet, since the cataract, which is midway between Wellington Valley and the marshes, was ascertained by barometrical admeasurement, to be 680 feet only above the ocean.
All the time the mercury continued to fall in the barometrical tube, and, on this last day, the novice noted that it kept continually below twenty-eight and seven-tenths inches. Besides, there was no appearance that the barometer would rise for some time. The aspect of the sky was bad, and extremely windy. Besides, thick fogs covered it constantly.
On the 18th of October we had another brilliant morning, after a cold night, the temperature having fallen to 4 degrees. I took the altitude of Yeumtso by carefully boiling two thermometers, and the result was 16,279 feet, the barometrical observations giving 16,808 feet.
I drew in a long breath and said: "Who sh-sh-sh-all I s-s-s-ay y-y-y-ou are?" and my right foot was doing great execution. True to its barometrical functions, my throat was predicting a storm. It came.
According to custom, Mr Sudberry went forward to the barometrical banjo, intending to tap it not that he expected correct information now. No; he had found out its falsehood, and was prepared to smile at anything it should say.
By a singular fatality, we remained two years in the Spanish colonies without receiving a single letter from Europe; and those which arrived in the three following years made no mention of what we had transmitted. The reader may imagine my uneasiness for the fate of a journal which contained astronomical observations and barometrical measurements, of which I had not made any copy.
This peak was found, by barometrical observation, to be thirteen thousand five hundred and seventy feet above the waters of the Gulf of Mexico. It bears the name of the Great Explorer, being called Fremont's Peak. The return trip was now commenced, all of the objects of the expedition having been successfully accomplished. The party again reached Fort Laramie in the month of September, 1842.
Eden, who corrupts all Spanish words, as do most travellers in our own times, calls it the Stancha: it is the Station des Rochers of M. Borda, as is proved by the barometrical heights there observed. These heights were in 1803, according to M. Cordier, 19 inches 9.5 lines; and in 1776, according to Messrs. Two inclined rocks form a kind of cavern, which affords a shelter from the winds.
If the mercury descended to a certain mark on the scale on a mountain-top whose height was known, why was not this a means of measuring the heights of all other elevations? And so the beginning was made which, with certain modifications and corrections in details, is now the basis of barometrical measurements of heights. In hydraulics, also, Torricelli seems to have taken one of the first steps.
Meanwhile, that confidence with which Dick Sand's heart filled instinctively, was going to be partly justified. The next day, March 27th, the column of mercury rose in the barometrical tube. The oscillation was neither sudden nor considerable a few lines only but the progression seemed likely to continue.
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