Nine geometricall exercises, for young sea-men and others that are studious in mathematicall practices: containing IX particular treatises, whose contents follow in the next pages. All which exercises are geometrically performed, by a line of chords and equal parts, by waies not usually known or practised. Unto which the analogies or proportions are added, whereby they may be applied to the chiliads of logarithms, and canons of artificiall sines and tangents. By William Leybourn, philomath.
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Title
Nine geometricall exercises, for young sea-men and others that are studious in mathematicall practices: containing IX particular treatises, whose contents follow in the next pages. All which exercises are geometrically performed, by a line of chords and equal parts, by waies not usually known or practised. Unto which the analogies or proportions are added, whereby they may be applied to the chiliads of logarithms, and canons of artificiall sines and tangents. By William Leybourn, philomath.
Author
Leybourn, William, 1626-1716.
Publication
London :: printed by James Flesher, for George Sawbridge, living upon Clerken-well-green,
anno Dom. 1669.
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Link to this Item
http://name.umdl.umich.edu/A48344.0001.001
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"Nine geometricall exercises, for young sea-men and others that are studious in mathematicall practices: containing IX particular treatises, whose contents follow in the next pages. All which exercises are geometrically performed, by a line of chords and equal parts, by waies not usually known or practised. Unto which the analogies or proportions are added, whereby they may be applied to the chiliads of logarithms, and canons of artificiall sines and tangents. By William Leybourn, philomath." In the digital collection Early English Books Online 2. https://name.umdl.umich.edu/A48344.0001.001. University of Michigan Library Digital Collections. Accessed June 16, 2024.
Pages
descriptionPage 4
PROP. IV. A right Line being given, to draw another right Line which shall be parallel thereto at any distance required.
LET A B be a Line given, and let it be required to draw another right Line which shall be parallel thereunto, and at the distance of the length of the Line C.—First, take the length of the Line C in your Compasses, and setting one foot to∣wards one end of the given Line, as at D, describe the Arch E.— Secondly, set one foot of the Com∣passes towards the other end of the given Line, as at F, and describe the Arch G.—Lastly, lay a Ruler to the Arches E and G, so that the Ruler onely touch the Ar∣ches, and not cut or cross them in any part. So a Line drawn thereby shall be parallel to the given Line A B, and at the distance of the Line C.
[illustration] geometrical diagram
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