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 1, 2024.

Pages

SECT. XXXVI. To know how much of the Horizontal-Line is contained directly under the Right-Line of any Shot called the Right-Range made out of any Piece at any Elevation assigned.

BE it propounded to find what part of the Horizontal-Line lyeth directly under the Right-Range of the Piece assigned at 30 degr. Elevation, the Right-Range for 30 deg. Mounture, by the last Rule is found to be 711 Paces, Work with the Complement of the Pieces Mounture 60 degr. thus always.

As the Radius 90 degr.	1000000
is to the number of Paces in the Right-Range 711 Paces	285186
So is the Compl. Sign of 30 degr. Mounture, which is 60 degr.	993969
to the Logarithm of the Horizontal-Base 619 Paces	279155

Now you find that 619 Paces lies under the Right-Range of the Shot, you may pre∣sently find how much of the Horizon is contained under the Crooked-Range of the Shot, if you Substract 619 the Horizontal Distance out of 2200, the Randoms at the first graze of the Bullet from the Piece, the Remainer is the Horizontal Distance 1581 Paces, which lies under the way of the Shot, as it goeth helically between the Right-Range, and the natural or perpendicular motion, or before it make the first graze; the like in all other questions.