Glass Twaddell No 3 hydrometer by unknown (possibl
Glass Twaddell No 3 hydrometer by unknown (possibly German) maker, and marked 'Twaddel's No 3'. Range 48 - 72. 229mm long. Lead weight and paper scale. In cardboard tube, 1870 - 1940. Hydrometer Index 290.
- Experimental Chemistry
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