Excerpt from Logarithmic and Trigonometric Tables

For the investigations of these rules the student is referred to the Treatise on Trigonometry, p. 87, or to works on Algebra.

The Common Logarithms (briggs's) are the only ones used in extensive numerical calculations, and the only ones given in the following tables.

The common logarithm of a number is the exponent of that power of 10 which is equal to the number.

Thus, the logarithm of 100 is 2, because 10' 100. This is usually written log 100 2. 10 is the base of the common system.

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