Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 91
(.7) Double horizontal discharge. (Simultaneous.) • (11) Vertical discharge with dark branches. j(8) Loop form of lightning. (12) Parallel discharge converging into one mainstem.
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Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
