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Updated: June 11, 2025
However, scent often improves at night when the dew begins to form; and it may also suddenly improve at any time of day should the dew point be reached, owing to the temperature cooling to the point of saturation. This is always liable to occur at some time, on days on which the hygrometer shows us that there is over ninety per cent of moisture in the air.
At length it grew to such a pitch, that the tube of the hygrometer containing the water was exhausted in a couple of nights. Notwithstanding the astonishment of Mr. H., he was enraptured at the triumphant confirmation of his theory. He devoted every moment he could spare from public duties, to the compilation of a learned and voluminous treatise upon the subject.
No such thing, sir! Ha!" 'Hygrometer l5' but this is not to-day's weather? Ah! no. Ha! 'Barometer 30.380. Ha! 'Sky cloudy, dark; wind, south, light. Ha! 'River rising. Ha! Professor Frowenfeld, when will you give your splendid services to your section? You must tell me, my son, for I ask you, my son, not from curiosity, but out of impatient interest."
The capsule of the geranium and the beard of wild oats are twisted for a similar purpose, and dislodge their seeds on wet days, when the ground is best fitted to receive them. Hence one of these, with its adhering capsule or beard fixed on a stand, serves the purpose of an hygrometer, twisting itself more or less according to the moisture of the air.
Some are known to you, such as the thermometer, which gives the internal temperature of the Nautilus; the barometer, which indicates the weight of the air and foretells the changes of the weather; the hygrometer, which marks the dryness of the atmosphere; the storm-glass, the contents of which, by decomposing, announce the approach of tempests; the compass, which guides my course; the sextant, which shows the latitude by the altitude of the sun; chronometers, by which I calculate the longitude; and glasses for day and night, which I use to examine the points of the horizon, when the Nautilus rises to the surface of the waves."
During these variations of the zodiacal light, the hygrometer indicated considerable dryness. The stars of the fourth and fifth magnitude appeared constantly to the naked eye with the same degree of light. No stream of vapour was visible: nothing seemed to alter the transparency of the atmosphere.
While the halo was visible at Cumana, the hygrometer denoted great humidity; nevertheless the vapours appeared so perfectly in solution, or rather so elastic and uniformly disseminated, that they did not alter the transparency of the atmosphere. The moon arose after a storm of rain, behind the castle of San Antonio.
I can only account for this valuable immunity by attributing it to some peculiarity of climate, in all probability to the same causes which counteract the evolution of noxious exhalations; for we did experience calms and very light winds, and the hygrometer during the greater part of the time indicated a very large amount of moisture in the atmosphere.
They are found here at all seasons, and nothing seems to denote that they make periodical migrations like salmon. While the thunder rolled around us, the sky displayed only scattered clouds, that advanced slowly toward the zenith, and in an opposite direction. The hygrometer of Deluc was at 53 degrees, the centigrade thermometer 23.7 degrees, and Saussure's hygrometer 87.5 degrees.
Senor Emperan showed us cottons dyed with native plants, and fine furniture made exclusively of the wood of the country. The name of his native country pronounced on a distant shore would not have been more agreeable to the ear of a traveller, than those words azote, oxide of iron, and hygrometer, were to ours.
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