Sounding the Ocean of Air: Being Six Lectures Delivered Before the Lowell Institute of Boston, in December 1898Society for Promoting Christian Knowledge, 1900 - 184 страници |
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Страница 34
... humidity , or the percentage of moisture in the air , as compared to the amount which it could contain at that temperature , is nearly the reverse at low and at high levels . It is found from the kite- observations at Blue Hill , that ...
... humidity , or the percentage of moisture in the air , as compared to the amount which it could contain at that temperature , is nearly the reverse at low and at high levels . It is found from the kite- observations at Blue Hill , that ...
Страница 40
... humidity of the ascending current , the drier it is , so much the higher must it rise to have its vapour condensed . In storms the rising current mingles with the stronger horizontal current above , which carries with it the upper ...
... humidity of the ascending current , the drier it is , so much the higher must it rise to have its vapour condensed . In storms the rising current mingles with the stronger horizontal current above , which carries with it the upper ...
Страница 50
... humidity at many different levels in the atmo- sphere , but in the northern hemisphere there is most cloud during the first half of the year and least during the latter half , probably because the increasing warmth at the earth's ...
... humidity at many different levels in the atmo- sphere , but in the northern hemisphere there is most cloud during the first half of the year and least during the latter half , probably because the increasing warmth at the earth's ...
Страница 71
... humidity with height agree very well with later observations . Jeffries and Blanchard undertook a more perilous voyage on January 7 , 1785 , from Dover across the Channel , landing in the province of Artois , after , so runs the ...
... humidity with height agree very well with later observations . Jeffries and Blanchard undertook a more perilous voyage on January 7 , 1785 , from Dover across the Channel , landing in the province of Artois , after , so runs the ...
Страница 75
... humidity did not change much with height , and it was nowhere very dry . Finally , the light of the clouds was proved not to be polarized , and the permanent composition of the atmosphere was confirmed . In 1861 another grant of money ...
... humidity did not change much with height , and it was nowhere very dry . Finally , the light of the clouds was proved not to be polarized , and the permanent composition of the atmosphere was confirmed . In 1861 another grant of money ...
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adiabatic rate aërial aeronaut Aérophile altitude anti-cyclone apparatus ATMOSPHERIC CIRCULATION automatic average ballons-sondes balloon ascents barometric pressure Berson Blue Hill Observatory captive balloon carbonic acid century changes of temperature circulation cirrus cloth boards cloud forms cold wave cooling cumulo-nimbus cumulus curve cyclones and anti-cyclones decrease of temperature descending different heights diurnal earth earth's surface El Misti exploring the air Fahrenheit fall of temperature Fcap free air German Glaisher ground heat high atmosphere hundred hygrometer Illustrations increasing altitude indicate Jeffries kite-flights kite-flying Kites at Blue Laplace's formula levels lift light lower measurements mercury meteorograph METERS metres miles an hour mountain nearly Nephoscope night obtained OCEAN OF AIR oxygen Paris PLATE Post 8vo Professor records relative humidity rising currents scientific shows stations strata tailless Kite temperature theodolites thermometer Tissandier trigonometrical tube ture Type upper air vapour vertical voyage warmer weather wind velocity wire zero
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Страница 78 - Shortly after, I laid my arm upon the table, possessed of its full vigour ; but on being desirous of using it I found it powerless — it must have lost its power momentarily.
Страница 79 - Then the instruments became dimly visible, then Mr. Coxwell, and very shortly I saw clearly. Next I arose in my seat and looked around as though waking from sleep, though not refreshed, and said to Mr. Coxwell : ' I have been insensible.' He said, 'You have, and I too, very nearly.
Страница 79 - I dimly saw Mr. Coxwell, and endeavoured to speak, but could not. In an instant intense darkness overcame me, so that the optic nerve lost power suddenly, but I was still conscious, with as active a brain as at the present moment whilst writing this. I thought I had been seized with asphyxia, and believed I should experience nothing more, as death would come unless we speedily descended : other thoughts were entering my mind, when I suddenly became unconscious as on going to sleep.
Страница 78 - I read the drybulb thermometer as minus 5°; after this I could not see the column of mercury in the wet-bulb thermometer, nor the hands of the watch, nor the fine divisions on any instrument. I asked Mr. Coxwell to help me to read the instruments. In consequence, however, of the rotatory motion of the balloon, which had continued without ceasing since leaving the earth, the...
Страница 67 - ... by observing the varying course of the currents of air or winds at certain elevations, to throw some new light on the theory of winds in general.
Страница 120 - ... of paper tied to them, should be let fall at stated periods from some of the higher kites ; which was accomplished by the gradual singeing of a match-line. When engaged in these experiments, though now and then they communicated immediately with the clouds, yet, as this happened always in fine dry weather, no symptoms whatever of an electrical nature came under their observation. The sublime analysis of the thunder-bolt, and of the electricity of the atmosphere, lay yet entirely undiscovered,...
Страница 78 - In consequence, however, of the rotatory motion of the balloon, which had continued without ceasing since leaving the earth, the valve-line had become entangled, and he had to leave the car and mount into the ring to readjust it. I then looked at the barometer, and found its reading to be 9fin., still decreasing fast, implying a height exceeding 29,000 feet. Shortly after...
Страница 120 - Their kites, from four to seven feet in height, and covered with paper, were fastened behind one another, each kite taking up as much line as could be supported, thereby allowing its companion to soar to an elevation proportionally higher. It is related that "the uppermost one ascended to an amazing height, disappearing at times among the white summer clouds, whilst all the rest, in a series, formed with it in the air below such a lofty scale, and that too affected by such regular and conspiring...
Страница 79 - ... writing this. I thought I had been seized with asphyxia, and believed I should experience nothing more, as death would come unless we speedily descended : other thoughts were entering my mind, when I suddenly became unconscious as on going to sleep. I cannot tell anything of the sense of hearing, as no sound reaches the ear to break the perfect stillness and silence of the regions between six and seven miles above the earth.