n of air in the path of the dis- away bythe spark. A thin film of smoke on glass, head, the points always extending toward the negative fixed by means of alcohol, yielded the first results ; but charge, or to the superior conducting power of. some conductor. 2 shows the tendency of strive to become… … the film, that it seems almost certain that the nature Fig. 2—POSITION OF THE PLATE BETWEEN THE Fig. 1—MARKS PRODUCED. BY LIGHTNING. of the film had very little to do with the direction TERMINALS, taken by the spark. : Figs. 8 to 7, inclusive, are photo-micrographs of va- The autographic record of…
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