Light and Electricity: Notes of His Courses of Lectures Before the Royal Institution of Great Britain

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D. Appleton & Company, 1878 - 194 pages
 

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Page 159 - ... of an inch), a bright spark was produced, and more than half the volume of the charcoal became ignited to whiteness; and by withdrawing the points from each other, a constant discharge took place through the heated air, in a space equal at least to four inches, producing a most brilliant ascending arch of light, broad, and conical in form, in the middle.

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