Gregg, J. B. [from old catalog] · Ada, Ohio, The University herald press · leaf 93
rce assumed for the field produced by the magnet at a distance of two inches from its pole; (6.) F:u the relative force of the field at a dis-tance of three inches; (7.) i^, the rela- _^——^-^^p tive force of the field at a distance of four inches. Assuming- the strength of the field of themag-net… … Magnetic Needle.
Physics
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