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At Paris, M. Hachette and M. Beudant succeeded in making tubes, in most respects similar to these fulgurites, by passing very strong shocks of galvanism through finely-powdered glass: when salt was added, so as to increase its fusibility, the tubes were larger in every dimension, They failed both with powdered felspar and quartz.
Neither will any small quantity of surface water serve to check the rage of the electric stroke, unless there is a connection of moisture with the mass of moisture below the soil. The depth to which lightning may penetrate before it is so dissipated as to lose its dangerous character is shown by the fulgurites, or "lightning-tubes," sometimes found in sandy soils.
In sand or rock, where lightning has struck, it often forms long hollow tubes, known to the calmly discriminating geological intelligence as fulgurites, and looking for all the world like gigantic drills such as quarrymen make for putting in a blast.
At Paris, M. Hachette and M. Beudant succeeded in making tubes, in most respects similar to these fulgurites, by passing very strong shocks of galvanism through finely-powdered glass: when salt was added, so as to increase its fusibility, the tubes were larger in every dimension.
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