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 23, 2025.

Pages

II. Sailing 57 Leagues upon the first Rhomb, How far am I de∣parted from the Meridian of the Place from whence I came?

By the Traverse-Table.

THis Question was answered in the last Example, and found over E. W. to be 47 Leagues and 39/100, as you may see in the small Table in the foregoing Side. In the like manner you may find the Difference of Latitude and departure from the Me∣ridian, for any Distance run upon any Point of the Compass, which is the Use of that Table.

By the Traverse-Scale.

EXtend the Compasses from 100 in the Line of Numbers, to the Distance run 57 Leagues; so is the Sine of the Rhomb; that is, put one Point of the Compass on 5 Points, in the Line of East and West of the Scale, and the other will reach to the Departure from the Meridian 47 Leagues 39/100 Parts.

By the Tables of Sines and Numbers, by the Fourth Case of Plain Triangles.

As the Radius or Sine of 90. deg. at E	1000000
Is to the Distance run 57 Leagues AD	175587
So is the Sine of the Rhomb 56 deg. 15 min. A	991084
To the Departure from the Meridian to 47 39/100 ED	166671

By the Artificial Lines on the Ruler.

EXtend the Compasses from 90 deg. to 57; the same Distance will reach from 56 deg. 15 min. to 47 39/100 Leagues.

Or, Extend the Compasses from 90, to 56 deg. 15 min. the same Distance will reach from 57 Leagues, to 47 39/100, as before.