File:Bbinary Abacus 002.jpg
From Infogalactic: the planetary knowledge core
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Summary
A binary abacus constructed by Dr. Robert C. Good, Jr.
Copyright status:
Creative Commons Attribution-Share Alike 3.0 Unported license.
Source:
https://commons.wikimedia.org/w/index.php?title=User:Jaynegeorge
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:26, 5 May 2019 | | 1,600 × 1,200 (1,007 KB) | Thales (talk | contribs) | A binary abacus constructed by Dr. Robert C. Good, Jr. |
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