The logarithm of a number is the index of the power to which the base of the system must be raised to equal a given number. Elementary Text-book of Trigonometry - Page 89 by Robert Hamilton Pinkerton - 1884 - 176 pages Full view - About this book
...Number of degrees per radian. TABLE 1.10 Factorials TABLE 1.11 Common and Natural Logarithms of Numbers The common logarithm of a number is the index of the power to which the base 10 must be raised in order to equal the number. The common logarithm of every positive number...