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 8, 2024.
Pages
For Example.
* 1.1Admit I have a Board that is 7 Foot long, and 18 Inches broad; Multiply 84 Inch. which is in 7 Feet by 18 Inches, the Product is 1512; which divide by 144 the Num∣ber of Inches in a Foot of flat-measure, and the Quotient shews 10 feet, and 72 remains, which is ¼ 144; therefore the Board contains 10 foot ½; but many times the Board falls out to be broader at one end, then it is at the other, add together the breadth at each end; then take the ½ for the true breadth.
And Work as before; But commonly Artificers have a Useful Line put upon their Rules for their ready Measuring of Board and Timber-measure; but this is the Exactest way, though that is near; and what have been said of Board-measure, only the same is to be understood is the way of Measuring not only Boards and Glass; but likewise all manner of Wainscot, Pavement, Floors, and such like; they depend upon one and the same Geometrical Ground, though they be reckoned by different measures, as you see by the Perch, Rod, Square, Yard or foot according to the Custom of the Place, there∣fore needs no further Example.
Extend the Compasses always from 12 Inches unto the breadth 18 Inches, the same extent will reach from the length 7 foot, unto the Number of Square foot in the Board, which is 10 5/10 foot.
AB 18 Inch × AD 7 foot/ = 10 4/10 feet.
Notes
* 1.1
Su••h Rules are made by Walter Hays in More-Fields, and in Brictly by P. Staynard.