Dipping needle

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“A small bar magnet suspended in such a manner as to allow it to assume its chosen position relative to the earth is a magnetic needle. The needle may turn in a horizontal plane, it is a horizontal needle; e.g., the mariner’s or the surveyor’s compass. If it turns freely in a vertical plane, it constitutes a dipping-needle.” — Avery, 1895




Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 458


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