![File:Duboscq colorimeter 1870.png](http://upload.luquay.com/wikipedia/commons/thumb/3/38/Duboscq_colorimeter_1870.png/597px-Duboscq_colorimeter_1870.png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 03:42, 17 June 2009 | ![]() | 644 × 647 (109 KB) | Dicklyon | {{Information |Description={{en|1=A drawing and diagram of a Duboscq colorimeter, for visually obtaining a color match between two columns of fluid to arrive at a quantitative concentration ratio.}} |Source=Chemical News, London, Jan. 21 1870, p. 31, via |
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