rom glass was prepared for smoking by smearing it over the positive terminal in a vacuum tube, which have with the oil, then removing all but a trace, then smok- substantially the same appearance as the marks shown ing it lightly over a very small gas jet or over a candle. in Fig. 7. The glass… … 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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