Atkinson, Philip. [from old catalog] · New York, The Century co. · leaf 74
r welded tomasses of metal. The protection afforded by the rod consists chiefly in STATIC ELECTRICITY. 51 its ability to prevent a disruptive discharge, by a gradual,silent discharge through its points, as illustrated by thesimilar discharge of a Ley den battery, described on page27, thus… … Fig. 15. circles, and hence is called also the aurora polaris ; thesouthern aurora being known as the aurora australis, andthe northern as the aurora borealis. Observation hasbeen chiefly confined to the latter, which occurs withinan irregular geographical belt about thirty degrees wide,extending…
Electricity
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