A discours of the variation of the cumpas, or magneticall needle. : Wherin is mathematically shewed, the maner of the obseruation, effectes, and application thereof, (1581)
Borough, William, 1536-1599 · [London] : Imprinted at London for Richard Ballard, and are to be solde at his shop at Sainct Magnus cornar in Themes streate · leaf 16
yfuche as other'tvife can not fom tyme to tyme calculate their dechnationsyccordyng to the place of the Sunneto bee giuen by the Ephemeridesynd table of declination of e Rgmholdus mate boldly ‘xif this Regiment for 20 .yeres Hpithout any fenfible err our. sAndfo 'tvifhyng my trauailes in this…
Compass · Nautical astronomy · Imprint 1581
Internet Archive · John Carter Brown Library · Public domain (published before 1931). Free to use for anything.
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