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Jackstaff
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Description: An instrument which could more readily adapt itself to the swaying of the observer's body in a sea-way, soon displaced in good measure the astrolabe on shipboard. It in several ways modified forms for a long time served mariners as a convenient help in ascertaining the altitude of the celestial bodies. Precisely when it was first introduced is not certain; but the earliest description of it which has been found is that of Werner in 1514.
Source: Narrative and Critical History of American (New York: Houghton, Mifflin, and Company, 1886)II:99
Keywords: compass, astronomy, jackstaff,
Copyright: 2009, Florida Center for Instructional Technology. See license.
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