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.
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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.
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"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 May 1, 2024.
PROP. VI. Between two numbers given, to find out a mean Arithmetical proportional.
THIS proposition might be performed without the help of the rule of proportion: ne∣vertheless because it conduceth to the Resolu∣tion of the next ensuing proposition, I insert it in this place; To operate it this is the Rule: add half the difference of the given Terms, to the lesser Term, so that Agragate, is the Arith∣metical mean required: Examp. Admit 20 and 50 to be the two numbers propounded: Now to operate this proposition, first according to the Rule, I find that the difference of the two given Terms 20, and 50, is 30, whose half is 15, which being added to the lesser Term 20, it makes 35, so is 35, a mean Arithmetical pro∣portion betwixt 20, and 50, given.
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