Effect of a metal core in a solenoid
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“Illustrating the effects of introducing an iron core into a solenoid. In the upper firgure, the air space or ‘air core’ surrounded by the solenoid offers considerable resistance to the passage of magnetic lines, allowing only a small number to pass through. If a pieve of iron be introduced, as in the lower figure, the number of lines will be greatly increased.” -Hawkins, 1917
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Hawkins and Staff Hawkins Electrical Guide Number One (New York: Theo. Audel and Company, 1917) 118
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