Graphs on the semi-log paper are more linear, than those on regular graph paper. They also are to a much different scale than graphs on rectangular graph paper because the vertical axis increases by exponential powers.
The main reason to graph data on semi-log graph paper is that when dealing with logs and exponential functions, the number increase rapidly, and semi-log paper allows you to plot all of your points, instead of only being able to plot 2 or 3 like on rectangular graph paper. Basically, if the graph is increasing exponentially, then using semi-log graph paper is easier.
One advantage to using semi-log graph paper is that you are able to graph exponentially increasing functions that have large numbers. One disadvantage is that you can't really see the shape of the graph because semi-log graph paper produces a more linear looking line.
A graph that has a logarithmic scale, and that has been graphed on semi-log graph paper could be misleading because the scale on semi-log graph paper is much different. It condenses the plot so that you can fit all of your points on the paper.
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