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Updated: May 27, 2025
Two hundred and five points have been determined in altitude by means of 1,319 barometric observations, and seventeen by means of the theodolite and spirit level. One hundred and ninety-two observations have been made for determining the variation of the magnetic needle at three important points.
The original record of the barometric observations, each verified by the initials of the observer, have been deposited in the State Department. The paths pursued by the traveling parties were marked by blazing trees. The position of the barometer at each place of observation was also marked.
Workmen were employed at a small canal, intended for conveying the waters of the Rio San Pedro to the farm, at a height of more than seventy feet. According to a barometric calculation, the site of the hacienda is only fifty toises above the bed of the Rio Guayra at La Noria, near Caracas.
Let us see to what extent this takes place. Thirteen cubic feet of free air at normal temperature and barometric pressure weigh about one pound. We have seen that 116 degrees of heat have been liberated at half stroke. The gauge pressure at this point reaches 24 pounds.
Her dimensions must have diminished through contraction, the length of her day must have lessened, her surface must have collapsed, and fractures taken place along the lines of least resistance; the density of the sea must have increased, its volume must have become less; the constitution of the atmosphere must have varied, especially in the amount of water-vapor and carbonic acid that it contained; the barometric pressure must have declined.
The second species of inequality can be recognised only by geodesical or barometric levellings, or by the course of rivers. It is called a mesa or table, and is composed of small flats, or rather convex eminences, that rise insensibly to the height of a few toises.
After you've landed us, go up to this altitude use the barometric altimeter, not the radar and hold position." Loudons leaned forward from the desk to the contraption Altamont had rigged up in the nose of the helicopter; one of the telescope-sighted hunting rifles clamped in a vise, with a compass and a spirit-level under it. "Rifle's pointing downward at the correct angle now?" he asked. "Good.
There was no snow, of course, for that had long since disappeared, owing to the rise of temperature, and no snow would have fallen in that latitude now, even in mid-winter, because the whole base of the atmosphere had been lifted up nearly six miles. Sea-level pressures were prevailing where the barometric column would once have dropped almost to the bottom of its tube.
The determination of the heights of mountains by triangulation is, of course, the method that in general commends itself to the topographer, though it may be questioned whether the very general use of aneroids for barometric determinations has not thrown this latter means of measuring altitudes into undeserved discredit when the mercurial barometer is used instead of its convenient but unreliable substitute.
Heat lightning had been playing for an hour or more in the gloomy west; a tree-toad in a nearby elm was prophesying thunder in unmelodious song: night-birds fluttered restlessly among the lofty branches; widely separated whiffs of a freshening wind came around the corner of the house. All of these had a barometric meaning to the wistful group. There was a thunderstorm on the way.
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