| Duboscq, Jules | <person> French optician, 1817-1886. See: Duboscq's colourimeter. (05 Mar 2000) |
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| Duboscq's colourimeter | An apparatus for measuring the depth of tint in a fluid by comparing it with a standard fluid; glass cylinders are immersed in each of two cups one containing standard fluid, the other the fluid to be tested; on looking through the cylinders, the tints are equalised by raising or lowering the cylinder in one cup, and the extent of this raising or lowering is indicated on a scale and gives the exact difference in tint. (05 Mar 2000) |