Matériaux pour l'étude des glaciers: Auteurs qui ont traité des hautes régions des Alpes et des glaciers, et sur quelques questions qui s'y rattachent. 4 v. 1864-70F. Savy, 1864 - Glaciers |
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aber Agassiz alluvions Alpen Alpes alpina andere août Arch Archives des sciences Ascension atlas atmosphérique auch Beobachtungen Berlin bestimmte Bewegung blocs erratiques carte géologique Chamounix color Comptes rendus d'eau degrés der Gletscher DESCRIPTION Desor diese Edinb Einfluss Eismeere endlich Erde Felsen finden Finsteraarhorn Firn Forbes fortwährend fossiles Fuss ganze ganzen Genève géol géologique glace glaciaires Glacier du Géant glacier inférieur gleich Gletscher Gletschereis Gletschers Grindelwald grösser Höhe Hugi Innern Jahr Jan Mayen Kälte Körner l'Aar l'eau Leipzig London Luft Masse Mémoires Mer de Glace météorologiques mètres altitude Mont-Blanc montagnes Monte-Rosa moraines motion naturelles de Genève neige névé oben Oberfläche obern observations oder pages phénomènes planches coloriées roches Schlagintweit Schnee schon Schr Schweiz sciences naturelles sich sind snow Société stake stries Suisse surface température terrains Theil thermomètre Tiefe UEBER Unters vallée viel Vosges Wärme Wasser wenig wieder wurde zeigt Zeit Zermatt Zürich zwei
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Page 162 - THE GLACIERS OF THE ALPS : being a Narrative of Excursions and Ascents. An Account of the Origin and Phenomena of Glaciers, and an Exposition of the Physical Principles to which they are related.
Page 197 - The width of the valley, also, often changes ; the glacier is forced through narrow gorges, widening after it has passed them ; the centre of the glacier moves more quickly than the sides, and the surface more quickly than the bottom. The point of swiftest motion follows the same law as that observed in the flow of rivers, changing from one side of the centre to the other, as the flexure of the valley changes.* Most of the great glaciers in the Alps have, in summer, a central velocity of two feet...
Page 185 - This index of refraction is still more materially affected when a body passes from the solid to the liquid, or from the liquid to the gaseous condition...
Page 171 - The clouds now whirled wildly round us, and the fine snow, which was caught by the wind and spit bitterly against us, cut off all visible communication between us and the lower world. As we approached the summit the air thickened more and more, and the cold, resulting from the withdrawal of the sunbeams, became intense. We reached the top, however, in good condition, and found the new snow piled up into a sharp...
Page 197 - When subjected to strain the glacier does not yield by stretching, hut by breaking; this is the origin of the crevasses. 15. The crevasses are produced by the mechanical strains to which the glacier is subjected. They are divided into marginal, transverse, and longitudinal crevasses; the first produced by the oblique strain consequent on the quicker motion of the centre ; the second by the passage of the glacier over the summit of an incline ; the third by pressure from behind and resistance in front,...
Page 135 - Le moral, dans les Alpes, n'est pas moins intéressant que le physique. Car, quoique l'homme soit au fond partout le même, partout le jouet des mêmes passions produites par les mêmes besoins ; cependant , si l'on peut espérer de trouver quelque part en Europe des hommes assez civilisés pour n'être pas féroces , et assez naturels pour n'être pas corrompus, c'est dans les Alpes qu'il faut les rechercher; dans ces hautes vallées où il n'ya ni seigneurs, ni riches, ni un abord fréquent d'étrangers.
Page 189 - ... namely, the want of ductility or tenacity of their parts. It is that fragility precisely, which, yielding to the hydrostatic pressure of the unfrozen water contained in the countless capillaries of the glacier, produces the crushing action which shoves the ice over its neighbour particles and leaves a bruise, within which the infiltrated water finally freezes and forms a blue vein. In the lava, on the other hand, where the tenacity is great, the discontinuity, if produced at all, is soldered...
Page 198 - The ice of many glaciers is laminated, and when weathered may be cloven into thin plates. In the sound ice the lamination manifests itself in blue stripes drawn through the general whitish mass of the glacier ; these blue veins representing portions of ice from which the air-bubbles have been more completely expelled.
Page 134 - C'est ainsi que la vue de ces grands objets engage le philosophe à méditer sur les révolutions passées et à venir de notre globe. Mais si, au milieu de ces méditations, l'idée des petits êtres qui rampent à la surface de ce globe , vient s'offrir à son esprit; s'il compare leur durée aux grandes époques de la nature , combien ne...
Page 164 - ... toward" it for another hour. To the sense of fatigue previously experienced, a new phenomenon was now added — the beating of the heart. We were incessantly pulled up by this, which sometimes became so intense as to suggest danger. I counted the number of paces which we were able to accomplish without resting, and found that at the end of every twenty, sometimes at the end of fifteen, we were compelled to pause. At each pause my heart throbbed audibly, as I leaned upon my staff, and the subsidence...