| Joined: | Mon Apr 2nd, 2012 |
| Location: | Carthew, Cornwall, United Kingdom |
| Posts: | 6874 |
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That's basically the circular slide rule I remember. The circulars are more accurate than the regular rules as they are in fact longer therefore the divisions are more accurately read.
I used to use mine all the time until 1973 when I went to university where I got an electronic calculator.
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Still learning after all these years!
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