The description and use of the universal planispheres; or, terrestrial and celestial globes in plano / [Samuel Dunn].

  • Dunn, Samuel, -1794
Date:
1759
Catalogue details

Licence: Public Domain Mark

Credit: The description and use of the universal planispheres; or, terrestrial and celestial globes in plano / [Samuel Dunn]. Source: Wellcome Collection.

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    212. Problem CL Given the Variation of the Compafs, at two Places, whofe Difference of Latitude and Difference of Lon¬ gitude are given, to find the Latitude and Longitude of each of thofe Places. Example. Suppofe the Difference of Latitude between the two Places to be 38°, and their Difference of Longitude 40% the Variation at the former Place io° Weft, and at the latter 200 Wdlj required the Latitude and Longitude of each Place ? Operation. Count among the Meridians and Parallels of La¬ titude, until you find two Places on the Planifphere, whofe Difference of Latitude and Longitude anfwer to thofe given* * and you have the Places required. Examples for Practice.