The mariners magazine, or, Sturmy's mathematical and practical arts containing the description and use of the scale of scales, it being a mathematical ruler, that resolves most mathematical conclusions, and likewise the making and use of the crostaff, quadrant, and the quadrat, nocturnals, and other most useful instruments for all artists and navigators : the art of navigation, resolved geometrically, instrumentally, and by calculation, and by that late excellent invention of logarithms, in the three principal kinds of sailing : with new tables of the longitude and latitude of the most eminent places ... : together with a discourse of the practick part of navigation ..., a new way of surveying land ..., the art of gauging all sorts of vessels ..., the art of dialling by a gnomical scale ... : whereunto is annexed, an abridgment of the penalties and forfeitures, by acts of parliaments appointed, relating to the customs and navigation : also a compendium of fortification, both geometrically and instrumentally / by Capt. Samuel Sturmy.
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Title
The mariners magazine, or, Sturmy's mathematical and practical arts containing the description and use of the scale of scales, it being a mathematical ruler, that resolves most mathematical conclusions, and likewise the making and use of the crostaff, quadrant, and the quadrat, nocturnals, and other most useful instruments for all artists and navigators : the art of navigation, resolved geometrically, instrumentally, and by calculation, and by that late excellent invention of logarithms, in the three principal kinds of sailing : with new tables of the longitude and latitude of the most eminent places ... : together with a discourse of the practick part of navigation ..., a new way of surveying land ..., the art of gauging all sorts of vessels ..., the art of dialling by a gnomical scale ... : whereunto is annexed, an abridgment of the penalties and forfeitures, by acts of parliaments appointed, relating to the customs and navigation : also a compendium of fortification, both geometrically and instrumentally / by Capt. Samuel Sturmy.
Author
Sturmy, Samuel, 1633-1669.
Publication
London :: Printed by E. Cotes for G. Hurlock, W. Fisher, E. Thomas, and D. Page ...,
1669.
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Link to this Item
http://name.umdl.umich.edu/A61915.0001.001
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"The mariners magazine, or, Sturmy's mathematical and practical arts containing the description and use of the scale of scales, it being a mathematical ruler, that resolves most mathematical conclusions, and likewise the making and use of the crostaff, quadrant, and the quadrat, nocturnals, and other most useful instruments for all artists and navigators : the art of navigation, resolved geometrically, instrumentally, and by calculation, and by that late excellent invention of logarithms, in the three principal kinds of sailing : with new tables of the longitude and latitude of the most eminent places ... : together with a discourse of the practick part of navigation ..., a new way of surveying land ..., the art of gauging all sorts of vessels ..., the art of dialling by a gnomical scale ... : whereunto is annexed, an abridgment of the penalties and forfeitures, by acts of parliaments appointed, relating to the customs and navigation : also a compendium of fortification, both geometrically and instrumentally / by Capt. Samuel Sturmy." In the digital collection Early English Books Online 2. https://name.umdl.umich.edu/A61915.0001.001. University of Michigan Library Digital Collections. Accessed June 15, 2024.
Pages
descriptionPage 199
RULE XIV.
As Radius, Is to Co-sine of Difference of Latitude 4 deg. 11 m.
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Take out the Co-sine of the Rhomb 73 deg. 08 min.
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There remains the Sine of the Distance 14 deg. 34 min.
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Which 14 deg. 34 min. converted into Leagues is 291 Leagues ⅓ the Distance you may sail W. S. W. ½ a Point Westerly, from Latitude 49 deg. 07 min. to Latitude 44 deg. 56 min. and the Difference of Longitude is 10 deg. as you may see by the former Table, by the Latitude 44 deg. 56 min. is 17 deg. 28 min. and the Difference of Longitude from Obliquity is 45 deg. 00 min. and the Longitudes according to my Globes made by Hon∣dius 8 deg. 24 min. and so work until you have calculated the Distance for every ¼ Point, or rather half Point, because ¼ of a Point cannot be well steered upon. It is no matter if you do not exactly keep the Arch of a Great Circle, for the Reasons be∣fore given: but as neer to it as you may conveniently, as Mr. Norwood hath sufficiently answered in his ninth Problem of Sailing by a Great Circle.
But let me advise you to get into your Latitude short of the Place you are bound to, for fear of mistakes in your Reckoning, and so over-shoot your Port to a greater disgrace, than the credit of Great Circle Sailing will bring you; and then to know what Distance you are to sail in that Parallel of Latitude.
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