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.

The ARGUMENT.

YOu're come to see a Sight, the World's the Stage; Perhaps you'l say, 'Tis a Star-gazing Age. Come out and see the Ʋse of Instrument, Can Speculation yield you such Content? That you can rest in Learning; But the Name Of flying Pegasus, or swift Charles-Wain. And would you learn to know how he doth move About his Axis, set at work by Jove? If you would learn the Practice, read, and then I need not thus intreat you by my Pen, To tread in Arts fair Steps, or gain the way; Go on, make haste, Delinquent, do not stay. Or will you scale Olympick Hills so high? Be sure take fast hold on Astronomy; Then in that fair-spread Canopy no Way From thee is hid, no not Galaxia. They that descend the Waters deep, do see Our great God's Wonders there, and what they be. They that contemplate on the Starry Sky, Do see the Works that he hath fram'd so high. Then learn the Worlds Division, and that Art Which I shall shew you in this Second Part.

IN this Book is contained both a general and particular Description, Making, and Use of all the most necessary Instruments belonging to the Art of Navigation; As the Mathematical Ruler, on which are these Scales following; viz. The Line of Chords, Points, Leagues, Longitude, Natural Sines, Tangents, Secants, at one End; at the other is Dialling Scales, viz. The Art of Dialling of all sorts, resolved by the Chords and Gnomon Line, and Scale of Six Hours; Scale of Inclination of Me∣ridians, and two Scales inlarging Hours; Lines upon any reclining, inclining, or de∣clining, Plain without a Center, called the greater and lesser Pole: On the other side is a Line of Artificial Signs, Tangents, and Numbers; A Meridian Line, according to Mercator's or Mr. Edward Wright's Projection; And Tables for the making of these Scales, with a Line of Longitude and Reduction, which are the Lines on the Mathe∣matical

Scale; also, A Portable most useful Travis-Scale, with a Table for to make it, with artificial Rhombs, Points, ½ Quarters, and Tangent-Rhombs, and the making of the Sinical Quadrant, and so ordered, that by the help of an Index, and Lines thereon, it shall answer most of the useful Questions in Astronomy and Navigation. Also the making the plain Sea-Chard, and the true Sea-Chard, and particular Chards for any Place; with the most useful and necessary Semicircle, that will protract any Angle, or run upon any Chard, without drawing Rhomb-lines to fill the Chard; that so, by help of this Instrument, the Chard may serve for many Voyages. Also the Ma∣king and Use of a Compleat Instrument, made in the manner and on the back-side of a Nocturnal, with 31 of the most useful and easiest Stars to be known in the North and South Hemisphere, of the first, second, and third Magnitude; which in a Mo∣ment, the Instrument being rectified, sheweth the Hour of the Night that any Star cometh to the Meridian, with his Declination N. and S. Also a Table of the De∣clination, Right Ascension, Latitude, and Longitude calculated from Tycho's Tables, re∣ctified for the year 1671. On the other side a Nocturnal so ordered, that it shall give you the Hour of the Night by the North-Star, and the brightest Guard, and his bearing every Point of the Compass from the Pole, whereby you may take the true De∣clination; and also being so rectified, sheweth the Suns place in each Sign and De∣gree in the Ecliptick every day in the year. The Making and the Use of the Cross-staff, Back-staff, Quadrant; The Making and Use of the small Pocket-Instrument, on which is contained the most useful Lines, Scales, and Proportions, that in an Instant will shew the Diameter of any sort of Ordnance at the Bore, and the length and weight of the Gun, and Shot, and Powder, in Brass or Iron; and the Diameter and Names of each Piece, Diameter of the Shot to each Piece, and the weight of any Iron Shot, the Diameter being given in Inches, with the breadth and length of the Ladle; And how many Paces point-blank any Piece will shoot, and of Randoms for the sixth Point of the Quadrant, which may by this Instrument be answered near enough for so short a time, to give any reasonable Man an answer to any useful Question in the Art of Gunnery. Also the Description of the Mariners Azimuth-Compass, so ordered that it shall measure all kind of Grounds whatsoever, whether Wood-land or other; and for taking of Heights and Distances, whether accessible or inaccessible: And by the help of the aforesaid Semicircle, to protract any Plot of a Field or Plantation whatso∣ever, as soon as any Instrument, as the Plain Table, the Theodolit or Circumferenter, with much delight and pleasure to the Ingenious Mariner, it agreeing so well with his Travisses at Sea. All which shall be shewn in the following Treatise in its due Place.