how would i make moddel of a logarithm?

Answer 1

Before the advent of the electronic calculator, most calculations were done with the slide rule which is two logarithmic scales that are able to slide past each other.

This site shows you how to build a slide rule by printing out free PDF files:

http://www.sphere.bc.ca/test/build.html

wiki gives a better explanation of what a slide rule is and how to use it:

http://en.wikipedia.org/wiki/Slide_rule