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Wind is as important as low temperature in producing chilling. A ten-mile-an-hour wind under some conditions is equivalent to a lowering of the external temperature 60°. On increase of wind velocity above ten miles per hour produces little additional cooling effect if wind-proof garments are worn. The problem of keeping warm is then primarily the providing of insulation from both wind and cold. To provide insulation from wind: A sheltered spot should be selected for camp. The tent should be thoroughly windproof. Becauseof the large amount of air that filters through ordinarytent walls, coated waterproof fabrics are warmer in heavywinds than the closest woven permeable cloths. |
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