of air in the path of the dis- away by the spark. A thin film of smoke on glass, head, the points always extending toward the negative charge, or to the superior conducting power of some fixed by means of alcohol, yielded the first results ; but conductor. 2 shows the tendency of striae to become… … the film, that it seems almost certain that the nature Fig. 2.-P0SITI0N OF THE PLATE BETWEEN THE Fig. l.-MARKS PRODUCED BY LIGHTNING. i of the film had very little to do with the direction TERMINALS. taken by the spark. The autographic record of such a discharge is some- Figs. 3 to 7, inclusive,…
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