ABSTRACT
By manipulation, a straight line graph may be plotted to produce a law relating the two variables. Knowledge of logarithms may be used to simplify plotting the relation between one variable and another. This chapter discusses logarithmic scales and log-log and log-linear graph paper. Log-log and log-linear graph paper is available to make the plotting process easier. Graph paper is available where the scale markings along the horizontal and vertical axes are proportional to the logarithms of the numbers. Graph paper having a linear horizontal scale and a logarithmic vertical scale may be used. This type of graph paper is called log–linear graph paper, and is specified by the number of cycles of the logarithmic scale. Direct measurement (say in centimetres) is not made with log-linear graph paper since the vertical scale is logarithmic and the horizontal scale is linear.
