Uniting Wire above the Needle

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“The instant this is done and the galvanic circle completed, the needle will deviate from its north and south position, turning towards the east or west, according to the direction in which the galvanic circle flows.” -Comstock 1850




J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 368


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