Occasional Papers on the Theory of Glaciers Now First Collected and Chronologically Arranged: With a Prefatory Note on the Recent Progress and Present Aspect of the TheoryA. and C. Black, 1859 - 278 páginas |
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Página 6
... centre of the glacier , and rising against the walls ; and this inclination sometimes extends nearly to the axis of the glacier , or the medial moraine , where I have observed the veins . deviating from the vertical by an angle of about ...
... centre of the glacier , and rising against the walls ; and this inclination sometimes extends nearly to the axis of the glacier , or the medial moraine , where I have observed the veins . deviating from the vertical by an angle of about ...
Página 7
... centre of pressure at C , and that the lines of equal pressure would be found in the direction of the dotted lines , following nearly the periphery of the glacier . Now these dotted lines precisely trace out the course of the veined ...
... centre of pressure at C , and that the lines of equal pressure would be found in the direction of the dotted lines , following nearly the periphery of the glacier . Now these dotted lines precisely trace out the course of the veined ...
Página 16
... centre moves faster than the sides of the ice - stream . In the lower and faster - moving part of the glacier , this disproportion is greatest , varying from one - third to one - half of the smaller velocity . Near the origin of the ...
... centre moves faster than the sides of the ice - stream . In the lower and faster - moving part of the glacier , this disproportion is greatest , varying from one - third to one - half of the smaller velocity . Near the origin of the ...
Página 19
... centre at an angle determined by the declivity of the rock or moraine which supports them , gradually becoming more vertical as the centre of the glacier is ap- proached , where they twist round by degrees , so as to become transverse ...
... centre at an angle determined by the declivity of the rock or moraine which supports them , gradually becoming more vertical as the centre of the glacier is ap- proached , where they twist round by degrees , so as to become transverse ...
Página 20
... centre is a narrow space , where not unfrequently the structure appears quite undefined . I have satisfactorily made out , however , in every glacier which I have had the means of examining with that view , that the conoidal structure ...
... centre is a narrow space , where not unfrequently the structure appears quite undefined . I have satisfactorily made out , however , in every glacier which I have had the means of examining with that view , that the conoidal structure ...
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Términos y frases comunes
ablation Alps analogy angle annual motion appears Arveiron August Balmat bands Bishop of Annecy Brenva cause centre Col du Géant compact congelation continuity convex Courmayeur crevasses curve curved bands daily motion declivity direction dirt-bands effect Etna evidence experiment fact feet fissures fluid friction frontal dip Glace of Chamouni Glacier des Bois glacier motion glacier moves glacier of Bossons Grindelwald horizontal hydrostatic pressure inches inclination internal July lava stream less Letter on Glaciers longitudinal lower marked mass measurement Mer de Glace millimetres Mont Blanc Montanvert moraine motion of glaciers mud-slide nearly névé observations origin parallel particles plane plastic Plate portion pressure produce remarkable retardation rock Saussure Saussure's season side sliding slope snow solid station summer surface Talefre temperature thawing theodolite theory of glaciers tion transverse Travels valley veined structure velocity vertical Vesuvius viscous theory volume whilst winter wrinkles