1
How to Use Semilog Graph Paper
In semilog paper the
axis is marked off so that the height represents the log of the
C
value to be graphed. If you look at a semilog graph you'll notice that the horizontal lines are
not drawn at even intervals, they start out sort of spread apart then get closer and closer until,
bing!
, they jump and are spread out again, and the same process repeats. In this way the graph
is broken up into
. Each cycle has 10 lines (counting the lines it shares with the cycles
cycles
immediately above and below.)
Semilog Graph
(3cycles)
The bottom line is the
for the
base line
first cycle, each line corresponding to the
bottom line is the base line for the cycle above
it. The base lines are those where the spaces
just below are small and those immediately
above are big. Each base line
always
represents a power of 10, that is
for some
"!
8
whole number
. (The power,
, can be
88
negative or zero.) For example the first line
stands for 1 or
or
or 1000, .
.. or one of
"!
"!!
1, 0.1, 0.01, 0.001, .
.. (20 is
a power of 10).
not
The next base line is labeled 10
the
times
bottom line, and each base line is always 10
times the preceding base line.
In each cycle, the line immediately
above the base line represents
the base
2 times
line, the line above that
the base line,
3 times
etc. In a cycle all the lines correspond to
multiples of the base line. So, for example, if the bottom line is labeled 10 the next line would
be 20, then 30, 40, 50, until 100 (
), which is the base line for next cycle; then
œ"!‚"!
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 Spring '10
 y.bahie
 Derivative, Logarithmic scale, Statistical charts and diagrams

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