The Forms of Water in Clouds and RiversD. Appleton, 1896 - 196 páginas |
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Términos y frases comunes
Agassiz Aiguille Aiguille du Dru Aletsch Aletsch glacier Alps Arveiron axis beautiful Bel Alp Bergschrund Bernese Oberland bottom called cascade centre chasms cloud Col du Géant crevasses cross descend distance eastern side fact fall feet fissures fixed Forbes formed freezing Glace Glacier des Bois Glacier du Géant glacier motion glacier moves Görner Grande Jorasse Grimsel Pass Grindelwald heat height ice-fall icebergs icicle inches a day July 28 lake lateral moraine liquefaction liquid look lower Märgelin maximum motion measurements medial moraine melting Mer de Glace Mont Montanvert Morteratsch glacier Moulin névé notice numbers observations opposite pass point of maximum point of swiftest Pontresina Ponts portion pressure produced rate of motion reach regelation Rhone ridge river rocks sketch slope snow Stake Inches strain surface swiftest motion Tacul Talèfre telescope temperature thawing theodolite transverse Trélaporte Unteraar valley vapour waves western width winter yards
Pasajes populares
Página 6 - To produce the cloud, in the case of the locomotive and the kettle, heat is necessary. By heating the water we first convert it into steam, and then by chilling the steam we convert it into cloud. Is there any fire in nature which produces the clouds of our atmosphere ? There is : the fire of the sun.
Página 189 - To the evidence adduced by Mr. Sharpe, Mr. Sorby added other powerful evidence, founded upon the microscopic examination of slate rock. Taking both into account, the conclusion is irresistible that such rocks have suffered enormous pressure at right angles to the planes of cleavage, exactly as the glacier has demonstrably suffered great pressure at right angles to its planes of lamination. 483. The association of pressure and cleavage is thus demonstrated ; but the question arises, do they stand...
Página 158 - Glace and a river there is a resemblance so complete that it is impossible to find in the glacier a circumstance which does not exist in the river. In currents of water the motion is not uniform either throughout their width or throughout their depth. The friction of the bottom and of the sides, with the action of local hindrances, causes the motion to vary, and only towards the middle of the surface do we obtain the full motion.
Página 3 - ... sometimes see a perfectly clear space between the funnel and the cloud. Through that clear space the thing which makes the cloud must pass. What then is this thing which at one moment is transparent and invisible, and at the next moment visible as a dense opaque cloud ? It is the steam or vapor of water from the boiler.
Página 36 - Here we have a reversal of the process of crystallization. The searching solar beam is delicate enough to take the molecules down without deranging the order of their architecture. Try the experiment for yourself with a pocket-lens on a sunny day. You will not find the flowers confused ; they all lie parallel to the surface of freezing. In this exquisite way every bit of the ice over which our skaters glide in winter is put together.
Página 31 - ... shapes, each star possessing six rays. There is no deviation from this type, though in other respects the appearances of the snow-stars are infinitely various. In the polar regions these exquisite forms were observed by Dr. Scoresby, who gave numerous drawings of them. I have observed them in mid-winter filling the air, and loading the slopes of the Alps. But in England they are also to be seen, and no words of mine could convey so vivid an impression of their beauty as the annexed drawings of...
Página 29 - ... noticed. You frequently see a streamer of cloud many hundred yards in length drawn out from an Alpine peak. Its steadiness appears perfect, though a strong wind may be blowing at the same time over the mountain head. Why is the cloud not blown away? It is blown away; its permanence is only apparent. At one end it is incessantly dissolved, at the other end it is incessantly renewed: supply and consumption being thus equalized, the cloud appears as changeless as the mountain to which it seems to...
Página 19 - The sun, you know, is never exactly overhead in England. But at the equator, and within certain limits north and south of it, the sun at certain periods of the year is directly overhead at noon. These limits are called the Tropics of Cancer and of Capricorn. Upon the belt comprised between these two circles the sun's rays fall with their mightiest power ; for here they shoot directly downwards, and heat both earth and sea more than when they strike slantingly.
Página 3 - Watch the cloud-banner from the funnel of a running locomotive; you see it growing gradually less dense. It finally melts away altogether; and if you continue your observations, you will not fail to notice that the speed of its disappearance depends upon the character of the day.
Página 1 - EVERY occurrence in Nature is preceded by other occurrences which are its causes, and succeeded by others which are its effects. The human mind is not satisfied with observing and studying any natural occurrence alone, but takes pleasure in connecting every natural fact with what has gone before it, and with what is to come after it.