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RIDLEY (MARK) A Short Treatise of Magneticall Bodies and Motions, FIRST EDITION, Nicholas Okes, 1613
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RIDLEY (MARK)
Footnotes
A landmark in the history of experimental science in England, Ridley's treatise was the most important work on magnetism after William Gilbert's De magnete. "Ridley gives directions for carrying out experiments on the loadstone, magnet, and terrella. He includes numerous engravings and descriptions of his improved instruments for determining the declination of the magnetic needle and for making use of the inclinatory needle for finding position at sea" (ODNB). Among the illustrations is a map showing New England, Virginia, and Terra Australis, and another with a volvelle of a quadrant.



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