The description and use of the universall quadrat.: By which is performed, with great expedition, the whole doctrine of triangles, both plain and sphericall, two severall wayes with ease and exactness. Also the resolution of such propositions as are most usefull in astronomie, navigation, and dialling. By which is also performed the proportioning of lines and superficies: the measuring of all manner of land, board, glasse; timber, stone. &c. / By Thomas Stirrup, Philomathemat.
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Title
The description and use of the universall quadrat.: By which is performed, with great expedition, the whole doctrine of triangles, both plain and sphericall, two severall wayes with ease and exactness. Also the resolution of such propositions as are most usefull in astronomie, navigation, and dialling. By which is also performed the proportioning of lines and superficies: the measuring of all manner of land, board, glasse; timber, stone. &c. / By Thomas Stirrup, Philomathemat.
Author
Stirrup, Thomas.
Publication
London :: Printed by R. & W. Leybourn, for Tho. Pierrpont, at the Sun in Pauls Church-yard,
1655.
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Subject terms
Astronomy
Dialing
Geometry
Navigation
Trigonometry
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"The description and use of the universall quadrat.: By which is performed, with great expedition, the whole doctrine of triangles, both plain and sphericall, two severall wayes with ease and exactness. Also the resolution of such propositions as are most usefull in astronomie, navigation, and dialling. By which is also performed the proportioning of lines and superficies: the measuring of all manner of land, board, glasse; timber, stone. &c. / By Thomas Stirrup, Philomathemat." In the digital collection Early English Books Online 2. https://name.umdl.umich.edu/A93912.0001.001. University of Michigan Library Digital Collections. Accessed May 15, 2024.
Pages
descriptionPage 102
CHAP. XIIII. In a rectangle Triangle having the angles and one of the sides given, to finde the other side and the base.
OPen the threed to the angle opposite to the side gi∣ven, so shall it intersect the right parallel of the side given, at the contrary parallel of the side required; and if to the intersection you place the bead, and apply the threed to the side of the quadrat, it shall there shew you the length of the base.
As in the right angled Triangle ABC in the 11 Chapter, the Side BC being given, opposite to the an∣gle BAC 36 degrees 52 minutes, it is required to finde the other Side AB, and the base AC.
First, open the threed to the angle of 36 degrees 52 minutes, so shall it cut the right parallel of 60, at the con∣trary parallel of 80, and such is the side AB, which was required.
The threed lying in the same position, if you place the bead to this intersection, and then apply the threed to the side of the quadrat, it shall there give you 100, for the base AC as was required.
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