Occasional Papers On the Theory of Glaciers Microform Now First Collected An
Occasional Papers On the Theory of Glaciers Microform Now First Collected An
James David Forbes
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J 80 VISCOUS THEORY OF GLACIER MOTION. [1845. most beautifully shown ; and are even more so in the model than in the engraving. The fissures are transverse and slightly convex to the origin in the higher part of the glacier, then gradually turning round they radiate from a centre in the lower part, exactly as in the glacier of Arolla (Travels in the Alps, Plate VI. ), and in all similar cases. The experiment above detailed was suggested to me by studying the ripple of streams of water, which ap...pears to have the same origin : and in very weak currents moving through very smooth and uniform channels (as the chiselled sides of water conduits) the same may be made manifest by throwing a handful of light powder on the surface, which then becomes divided into threads of particles inclined in the manner I have described at a certain angle from the side towards the centre, depending on the velocity of the stream. The slightest prominence of any kind in the wall of such a conduit, a bit of wood or tuft of grass, is sufficient to produce a well-marked ripple-streak, from the side towards the centre, depending upon the sudden and violent retardation of the lateral streamlets and the freer central ones being momentarily edged away from them.
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