The Mariner's Compass' rectifier as a spinning wheel in a book, 1756
Andrew Wakely, a mathematician, first published The Mariner’s Compass Rectified in 1694. The book was extremely popular; dozens of editions were printed over the course of nearly a century. The “rectifier,” shown here, is used to “readily rectify your compass when it doth vary.” The inner circle “representeth the compass that you steer by, which is subject to Variation,” while the outer circle “representeth a true compass that never varieth.” A single thread attaches the spinning wheel to text block page. The tail of the thread is visible on verso. Author: Andrew Wakely, mathematician Title: The mariner's compass rectified Call number: VK577.W35 1756 Vovelle p. 95 MIT Libraries: The Vail Collection.
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