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.

About this Item

Title

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

Cite this Item

"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 25, 2025.

Pages

The Fourth PRECEPT, CASE, or EXAMPLE.

IF a Ship sail East or West, and the Dead and Observed Latitude doth agree, the Reckoning cannot be corrected; but if they differ, the Error will be partly in the Rhomb, and partly in the Distance: In such a Case keep the Meridian-distance, and the Difference of Latitude is the Distance you are gone to the Northward or South∣ward of the East and West.

By the Traverse-Scale.

EXtend the Compasses from 100, to the Distance sailed; the same Extent will reach from the Difference of Latitude by Observation, to the true Course: So that you may in a moment do all these Questions and Cases by the Traverse-Scale, and Line of Numbers and Artificial Points and Quarters thereon. If you have but the perfect Use of it, I know there is no Instrument whatsoever more ready to resolve any useful Question, and correct your Reckoning.

Lastly, If by frequent Observation you find the Ship is still carried from the East or West, either Northward or Southward, you may conclude some Current to be the cause thereof: Keep the Distance by Dead Reckoning and Observation, and the Diffe∣rence is the Distance from the Parallel.

We will not multiply too many Examples, but rather advise the Ingenious to make use of such as his need shall require; for understanding what hath been said, will be advantageous to the Practitioner.