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Show Artificial Glaciers. An excellent object lesson has been given by Herr Koch,' the German physicist phys-icist who wishes to illustrate the formation for-mation of glaciers to his students. He took a square tray, having a sloping gutter, down which yellow pitch, resembling re-sembling colophony, which, like ice, is plastio under pressure and brittle under tension, was allowed to flow, the gutter being first lined with very hot pitch 60 m to give the main flow a better hold on the sides. Transverse fissures, lik ho crevices in a glacier, appear in the middle of the stream, and smaller ones join them from the edges. Where (he bed widens longitudinal crevices are I produced. Loudon Times. |