Thesaurarium mathematicae, or, The treasury of mathematicks containing variety of usefull practices in arithmetick, geometry, trigonometry, astronomy, geography, navigation and surveying ... to which is annexed a table of 10000 logarithms, log-sines, and log-tangents / by John Taylor.
About this Item
Title
Thesaurarium mathematicae, or, The treasury of mathematicks containing variety of usefull practices in arithmetick, geometry, trigonometry, astronomy, geography, navigation and surveying ... to which is annexed a table of 10000 logarithms, log-sines, and log-tangents / by John Taylor.
Author
Taylor, John, mathematician.
Publication
London :: Printed by J.H. for W. Freeman,
1687.
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Subject terms
Mathematics -- Early works to 1800.
Link to this Item
http://name.umdl.umich.edu/A64224.0001.001
Cite this Item
"Thesaurarium mathematicae, or, The treasury of mathematicks containing variety of usefull practices in arithmetick, geometry, trigonometry, astronomy, geography, navigation and surveying ... to which is annexed a table of 10000 logarithms, log-sines, and log-tangents / by John Taylor." In the digital collection Early English Books Online. https://name.umdl.umich.edu/A64224.0001.001. University of Michigan Library Digital Collections. Accessed June 16, 2025.
Pages
descriptionPage 42
PROP. XIII. To find a mean proportional Line between any two right lines given.
Let the two given lines be A, and B, be∣tween which it is required to find a mean pro∣portional line. To perform which, first joyn the two lines A, and B together, so as they make the right line CED: Then describe thereon a* 1.1 Semicircle CFD. Then on the point E, erect the perpendicular EF, (by 1 prop.) to cut the limb of the Semi-circle in F, so shall EF, be a mean proportional line, between the two given lines A, and B, as required.