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RIDLEY, Mark (1560-1624). A Short Treatise of Magneticall Bodies and Motions. London: Nicholas Okes, 1613.
RIDLEY, Mark (1560-1624). A Short Treatise of Magneticall Bodies and Motions. London: Nicholas Okes, 1613. Small 4 o (172 x 123 mm). Engraved title by Renold Elstrack (Johnson p.15), engraved portrait, 21 engravings in text (one with two maps showing New England, Virginia and Terra Australis), printer's woodcut device on last leaf X3, (without the volvelle and final blanks, small portion of G2 supplied in facsimile affecting a few words, title laid down, light worming at beginning, trimmed close shaving a few head lines, a few other tears and repairs.) Modern calf. Provenance : William Davenport (early signature on title). FIRST EDITION, FIRST ISSUE, without the errata on X3r. Ridley, following William Gilbert's work De magnete , "here presented directions for a series of experiments on the lodestone, magnet, and terella which could be carried out by anyone interersted in the subject. He added engravings and descriptions of his improvised instruments for determing the variation, and for making use of the inclinatory needle for finding position at sea. This was in accordance with the method published jointly by Edward Wright Thomas Blundeville and Henry Briggs" (Taylor). Johnson Astronomical Thoughts in Renaissance England 235-38; Mottelay Bibliography of Electricity and Magnetism 97; Sabin 71297; STC21045; Wheeler Gift 86.