Non-logarithmic Slide Rule
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This Demonstration illustrates multiplication by two non-logarithmic slide rules.[more]
In the first case, define . Then . This slide rule has the four scales , , , and .
In the second case, define . Then . This slide rule has the four scales: , , , and , but and can be considered the same.
When , read on the bottom scale below on the scale.[less]
Contributed by: Izidor Hafner (August 2012)
Open content licensed under CC BY-NC-SA
 J. Bryant and C. Sangwin, How Round Is Your Circle?, Princeton, NJ: Princeton University Press, 2008 pp. 247–248.