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 9
To the Trauelers,8eamen,and s/W Miners of England?, … hath attributed in his dedication > that > 'Whiche f acknowledge not to bee de'Wefm the 'Whiche amon~ geH other diners vertues andproperties of the £Ma~ gnes or Lodeftone , he intreateth of the declinyng of the Dfeedle touched therewith from the plaine of the Horizon^ ( a matter neuer before…
Compass · Nautical astronomy · Imprint 1581
Internet Archive · John Carter Brown Library · Public domain (published before 1931). Free to use for anything.
