The Analogie or Proportion.
As the proper Distance of the two Places upon the Rhumb is to the Radius;
Nine geometricall exercises, for young sea-men and others that are studious in mathematicall practices: containing IX particular treatises, whose contents follow in the next pages. All which exercises are geometrically performed, by a line of chords and equal parts, by waies not usually known or practised. Unto which the analogies or proportions are added, whereby they may be applied to the chiliads of logarithms, and canons of artificiall sines and tangents. By William Leybourn, philomath.
About this Item
- Title
- Nine geometricall exercises, for young sea-men and others that are studious in mathematicall practices: containing IX particular treatises, whose contents follow in the next pages. All which exercises are geometrically performed, by a line of chords and equal parts, by waies not usually known or practised. Unto which the analogies or proportions are added, whereby they may be applied to the chiliads of logarithms, and canons of artificiall sines and tangents. By William Leybourn, philomath.
- Author
- Leybourn, William, 1626-1716.
- Publication
- London :: printed by James Flesher, for George Sawbridge, living upon Clerken-well-green,
- anno Dom. 1669.
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http://name.umdl.umich.edu/A48344.0001.001
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"Nine geometricall exercises, for young sea-men and others that are studious in mathematicall practices: containing IX particular treatises, whose contents follow in the next pages. All which exercises are geometrically performed, by a line of chords and equal parts, by waies not usually known or practised. Unto which the analogies or proportions are added, whereby they may be applied to the chiliads of logarithms, and canons of artificiall sines and tangents. By William Leybourn, philomath." In the digital collection Early English Books Online 2. https://name.umdl.umich.edu/A48344.0001.001. University of Michigan Library Digital Collections. Accessed June 8, 2024.
Pages
Page 190
So is the Difference of Longitudes to the Inclination of the Rhumb to the Meridian:
And
So is the Co-sine of the Rhumb from the Meridian to the Dif∣ference of Latitudes.
Thus, the Difference of Longitudes being 5 ½ degr. their pro∣per Distance upon the Rhumb 6 degr. and the Latitude of one of the Places 50 d. the Difference of Latitudes will be found to be 5 d.