The y-axis on a semi logarithmic chart is exponential. This way, when an exponential function is depicted in the chart, it will evolve as a linear function. You often do this to proove that the function is exponential and/or as a tool to help you find the equation for the function.
For more see:
http://www.answers.com/topic/semi-logarithmic-plot
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anti logarithm
You take the logarithm of each term.
The logarithm of 1.5 is approximately 0.1760912591... Your logarithm is base 10, and the natural logarithm of 1.5 (base e), is approximately 0.4054651081... Example base: 8 Approximately: 0.1949875002...
The value of the common logarithm is undefined at 0.
John Napier created the Logarithm table.