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The works of Edmund Gunter : containing the description and use of the sector, cross-staff, bow, quadrant, and other instruments : with a canon of artificial sines and tangents to a radius of 10.00000 parts, and the logarithms from an unite to 10000 : the uses whereof are illustrated in the practice of arithmetick, geometry, astronomy, navigation, dialling, and fortifcation : and some questions in navigation added by Mr. Henry Bond ... : to which is added, the description and use of another sector and quadrant, both of them invented by Mr. Sam. Foster ..., furnished with more lines, and differing from those of Mr. Gunters both in form and manner of working. -- (1673)

Gunter, Edmund, 1581-1626 · London : Printed by A.C. for Francis Eglesfield ... · leaf 362

An illustration from The works of Edmund Gunter : containing the description and use of the sector, cross-staff, bow, quadrant, and other instruments : with a canon of artificial sines and tangents to a radius of 10.00000 parts, and the logarithms from an unite to 10000 : the uses whereof are illustrated in the practice of arithmetick, geometry, astronomy, navigation, dialling, and fortifcation : and some questions in navigation added by Mr. Henry Bond ... : to which is added, the description and use of another sector and quadrant, both of them invented by Mr. Sam. Foster ..., furnished with more lines, and differing from those of Mr. Gunters both in form and manner of working. --, 1673, leaf 362
— 3A | The Defcription of the Hour-lines CHAP. HI. ra To draw the Hour-lines in a Meridian Plane. A Meridian Plane is that which is parallel to che Meridian Circle in ; the Fundamental Diagram, reprefented by $.-ZN 3 it hath two ‘Faces, one to the Eaft, and the other to the Weft; ineach of them the… … other, asin a Polar Plane ; the difference being only in the placing of the Equator, and in numbring of the Hours. 1 For in thefe Meridian Planes having drawn an occult Vertical Line CZ, and an occult Horizontal Line C N, croffing onethe other at Right Anglesia the Point C, the Equator AC will cuc…

Mathematical instruments · Logarithms · Sundials · Navigation -- Early works to 1800

Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.

More pictures from The works of Edmund Gunter : containing the description and use of the sector, cross-staff, bow, quadrant, and other instruments : with a canon of artificial sines and tangents to a radius of 10.00000 parts, and the logarithms from an unite to 10000 : the uses whereof are illustrated in the practice of arithmetick, geometry, astronomy, navigation, dialling, and fortifcation : and some questions in navigation added by Mr. Henry Bond ... : to which is added, the description and use of another sector and quadrant, both of them invented by Mr. Sam. Foster ..., furnished with more lines, and differing from those of Mr. Gunters both in form and manner of working. --

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