Image: Induction coil cutaway
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Description: Drawing of an induction coil from a 1920 book on radio apparatus, with the outer surfaces drawn transparent, to show the construction.
Title: Induction coil cutaway
Credit: Downloaded from Harry Winfield Secor (1920) The How and Why of Radio Apparatus, 1st Ed., Experimenter Publishing Co., New York, p.5 on Google Books
Author: Harry Winfield Secor
Permission: Public domain in USA - published in USA before 1923
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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