Graphing on a semi-log paper.

Hi, in 1 cycle of the log axis, there are 10 unequally-spaced lines, the values of which increase linearly, e.g. (0.1, 0.2, 0.3...), (1, 2, 3...), (10, 20, 30...). My question is, how can I determine the value between any 2 lines? Do the values increase linearly within these 2 lines, e.g. 0.25 is located at the mid-point between line 0.2 and line 0.3?

Thanks in advance!

It's a logarithm. There is nothing linear about it. However, there comes a time when a linear approximation is close enough. You'll have to decide just how this works with your particular application.