Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 299
§ 227. Luminous effects. —Figure 191 represents a glass shadehaving circular bits of tinfoil pastedsi)irally around it, from top to bot-tom, and about 1° apart. If thepoles of an induction coil, or theconductors of an electrical machine, are connected, one witheach extremity of this spiral line, an…
Physics
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