Snow, Benjamin Warner, 1860- · Madison, Wis. · leaf 404
tential to the higher, though we ordi-narily speak of the current as flowing from the region of thehigher potential to thd lower. The bright spark \Yliic*^^ occurs,however, is not the electricity, but is a column of air heated toincandescence by the energy of the electric discharge.. Thecrooked… … Fi<;. 217. Photograph of lightningby Kayser, showing banded appear-ance. Fig. 218. Dark lightiiiiif The lightning flasli is simply an electric discharge ui)on anenormous scale which takes place between two clouds, or l)etweena cloud and the earth when these are oppositely charged. Cer-tain…
Physics
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