Waves of sand and snow and the eddies which make them . e track is double and the sledgeskeep to the right-hand side. In the streets, how-ever, the ridges were not quite at right angles tothe course, the ridge being pushed slightly at bothends in the direction in which the sledges aredriven, indicating a small amount of movementsince their formation. These undulations are known by their Frenchname cahots, or jolts, which is the same word asis used for holes in ordinary roads. A long series of cahots was very quickly pro-duced upon the frozen St. Lawrence in snow aboutI o inches deep ; indeed,
Waves of sand and snow and the eddies which make them . e track is double and the sledgeskeep to the right-hand side. In the streets, how-ever, the ridges were not quite at right angles tothe course, the ridge being pushed slightly at bothends in the direction in which the sledges aredriven, indicating a small amount of movementsince their formation. These undulations are known by their Frenchname cahots, or jolts, which is the same word asis used for holes in ordinary roads. A long series of cahots was very quickly pro-duced upon the frozen St. Lawrence in snow aboutI o inches deep ; indeed, it was surprising to seehow soon the flat snow surface overlying smoothice was thrown into waves by the sledge one of the streets of Montreal I saw the oldcahots being hacked up and the consolidated snowrelaid. It was, indeed, more like ice than Winnipeg, during the great cold of Januaryand February, the snow did not form cahots, exceptwhere, a snowdrift having consolidated, there wereone or two slight undulations, obviously made by. -a o N a. 229 SNOW-MUSHROOMS AND CAHOTS 231 the bumping of the sledges in passing over theobstruction. Those persons to whom I spoke about cahotshad no doubt as to their origin. The transverseridges and furrows, they said, were only producedwhen some obstruction made the sledge bump. Thiswas usually hardened snow—, a drift blownacross a road. Sometimes, however, the sledgestarted bumping on account of a hole in the road-way beneath the snow. I decided, however, toexamine for myself the conditions of their forma-tion, both with respect to the movements of thesledge and the character of the surface over whichit travels. The motions of a sledge differ greatly from thoseof a wheeled vehicle. The gliding runner meetsobstructions at a very slight, or grazing, angle, andis very easily deflected from its course. If thedeflection be in a vertical plane, the sledge pitchesas a boat does. If the deflection be in a hori-zontal plane, t
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Keywords: ., bookcentury1900, bookdecade1910, bookidwavesofs, booksubjectwaves
