Logarithmic Table
The logarithmic table consists of three parts:
1. The extreme left column consisting of two digit numbers from 10 to 99.
2. Ten columns containing four digit numbers preceded by a decimal point, headed by the digits from 0 to 9.
3. Nine columns in groups of threes called mean difference columns, headed by the digits from 1 to 9.
A logarithmic table is shown below: