Depicts William Hyde Wollaston's Synoptic Scale of Chemical Equivalents from 1813, which is meant to give "the composiion of any weight whatever of any of the salts contained on the scale, the quantity of any other salt necessary to decompose it, the quantity of new salt that will be formed, and many other similar things, which are perpetually occurring to the practical chemist, and cannot be answered without an arithmetical calculation."
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Accum, Friedrich Christian. “Plate 17: Dr. Wollaston's Scale of Chemical Equivalents.” In An Explanatory Dictionary of the Apparatus and Instruments Employed in the Various Operations of Philosophical and Experimental Chemistry. London, England: Thomas Shotter Boys, 1824. https://digital.sciencehistory.org/works/w0892994f.
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