31 century museum in kanazawa

129 : A slide rule, a loupe and book

129----Junichi Takeuchi
竹内 順一

This is a slide rule that I used in around 1970’s. Its material is bamboo. It is to say that it takes one and half year to make a slide rule after cutting bamboo because of reacting to the alteration of humidity.  This slide rule has great ability in various calculations such as a surplus calculation, trigonometric, a logarithm, a parallel root, and the cube root, e.t.c.  At that time, there was no comuter nor calculator.



Share Published on Dec 01, 2009 at 12:43 am.
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