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Lost at Sea



Tools for Navigation: Instruments, cont'd


 


Samuel Sturmy. The mariners magazine; or, Sturmy's mathematical and practical arts. London, 1669

Samuel Sturmy intended his lively volume to educate his brothers, sons, and any other young men who wanted to go to sea in seventeenth-century England. Drawing on his own experience in a career spent traveling from Bristol to Virginia and the West Indies, it presents clear instructions that could be used with no greater mathematical knowledge than arithmetic. The volume also contains instructions for using navigational instruments, such as this nocturnal, which was designed to use the altitude of a given star to compute time at night.

 

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Edmund Gunter. The description and use of the sector, crosse-staffe, and other instruments. London, 1636



John Blagrave. The mathematical jewel. London, 1585





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