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Updated: May 31, 2025
Through a tube half exhausted, on connecting it with an induction coil, he obtained merely the ordinary series of sparks; in a tube three-quarters exhausted, he obtained a reddish glow from end to end, a torpedo-shaped stream of fire; through a tube exhausted to a fairly high degree what the electric companies would call "not bad" he obtained a beautiful steaked effect of bluish striæ in transverse layers.
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