Meteorological Essays and Observations, Volume 2T. and G. Underwood, 1827 - 643 pagine |
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Brani popolari
Pagina 614 - From the foregoing statements it may be safely inferred that " the mean height of the barometer at the level of the sea being the same in every part of the globe...
Pagina 534 - ... of dryness are kept up in the interior, or a degree of saturation not exceeding 528. To this in a clear, night we may add at least 6° for the effects of radiation, to which the glass is particularly exposed, which would reduce the saturation to 434°, and this is a degree of drought which must be nearly destructive. It will be allowed that the case which I have selected is by no means extreme, and it is one which is liable to occur even in the summer months. Now by an external covering of mats,...
Pagina 514 - ... upon the acclivities of hills. Excessive exhalation is very injurious to many of the processes of vegetation, and no small proportion of what is commonly called blight may be attributed to this cause. Evaporation increases in a prodigiously rapid ratio with the velocity of the wind, and anything which retards the motion of the latter, is very efficacious in diminishing the amount of the former; the same surface, which in a calm state of the air would exhale 100 parts of moisture, would yield...
Pagina 570 - For, if the latter had been the case, the mercury, which contained no air after being boiled, would, from its greater density, have sunk in the tube, when surrounded by mercury which had not been boiled, and would have risen gradually as it became saturated with air. I am justified in drawing the conclusion from the contrary effect, that the air had insinuated itself between the metal and the tube ; for the capillary depression is known to be in inverse proportion to the affinity of the fluid for...
Pagina 533 - ... degrees, but the degree of saturation will remain nearly the same, and a copious dew will quickly form upon the glass, and will shortly run down in streams. A process of distillation is thus established, which prevents the vapour from attaining the full elasticity of the temperature. This action is beneficial within certain limits, and at particular seasons of the year ; but when the external air is very cold, or radiation proceeds very rapidly, it may become excessive and prejudicial.
Pagina 477 - The velocity of the earth's rotation at the equator is, in round numbers, 1,000 miles an hour; at latitude 30° it is about 860, or about 140 miles an hour slower. The average velocity of the earth's easterly motion, in the space between the equator and latitude 30°, may be stated at 950 miles an hour ; while that of the belt lying between thirty and forty degrees, is not much above 800 miles an hour.
Pagina 529 - Captain Sabine, in his meteorological researches between the tropics, rarely found, at the hottest period of the day, so great a difference as ten degrees between the temperature of the air and the dewpoint ; making the degree of saturation about 730, but most frequently 5° or 850 ; and the mean saturation of the air could not have been below 910.
Pagina 515 - SE inclusive is to that of the air from the other quarter of the compass, in the proportion of 814 to 907 upon an average of the whole year : and it is no uncommon thing in spring for the dew-point to be more than 20...
Pagina 484 - ... will be very apt to make sad blunders in his navigation. I confess that I once laid myself open to an accusation little short of this, for which I had less excuse, perhaps, than another man, since, from having long speculated upon these topics, I had in a great measure satisfied myself of the truth of these theories. Yet when I was sent to visit the southwest coast of Mexico alluded to, and was left to my own choice as to the manner of performing the voyage, I miscalculated the probable effect...
Pagina 485 - In consequence of this, regard must be often had to the nature ply, being possessed not only with a rapid eastern velocity, but with a motion from the south, produces the south-west monsoon in the Indian ocean, bay of Bengal, and in the China sea. When the sun, on the other hand, goes to the south, the same seas are occupied by air which, coming from regions beyond the northern tropic, possesses less easterly velocity than the space they are drawn to, which gives them an easterly character; and this...