Dipping Needle

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“Dipping needle, a magnetic needle mounted on a horizontal support, and free to move in a vertical plane. The dipping needle is used to test the force of the earth’s magnetism at different places on its surface.” -Foster, 1921

Keywords

measure, dipping needle, magnetic needle, Earth's magnetism, magnetic force, magnet tool

Galleries

Magnetism

Source

Ellsworth D. Foster ed. The American Educator (vol. 3) (Chicago, IL: Ralph Durham Company, 1921)

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