A Treatise on Plane and Spherical Trigonometry: With an Introduction, Explaining the Nature and Use of Logarithms; Adapted to the Use of Students in Philosophy (Classic Reprint)

Excerpt from A Treatise on Plane and Spherical Trigonometry: With an Introduction, Explaining the Nature and Use of Logarithms; Adapted to the Use of Students in Philosophy

Rule. Add the logarithms of the numbers toge ther, and the fum 13 the logarithm of their produét.

For let a=b, afzc, oz=d3 then, a345]z=bcd; and (2 x is the logarithm of b, y the logarithm of c, 2 the logarithm of d, and x +_y+z is the logarithm of bed.

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