Clipart tagged: ‘dipping needle’

"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

Dipping Needle

"Dipping needle, a magnetic needle mounted on a horizontal support, and free to move in a vertical plane.…

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