File:Zoonomia Fig3.png
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| Description | Fig 3. Look through a dark tube, about half a yard long, at the area of a yellow circle of half an inch diameter, lying upon a blue area of double that diameter, for half a minute; and on closing your eyes the colours of the spectrum will appear similar to the two areas, as in fig. 3.; but if the eye is kept too long upon them, the colours of the spectrum will be the reverse of those upon the paper, that is, the internal circle will become blue, and the external area yellow. |
| Date | |
| Source | Zoonomia, or, the Laws of Organic Life, Second Edition, Volume I., available freely at Project Gutenberg |
| Author | Erasmus Darwin |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:05, 3 January 2011 | | 400 × 400 (781 bytes) | Keith Edkins | {{Information |Description=Fig 3. Look through a dark tube, about half a yard long, at the area of a yellow circle of half an inch diameter, lying upon a blue area of double that diameter, for half a minute; and on closing your eyes the colours of the spe |
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