Daniell Element
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
The Daniell element is a constant, non-polarizing galvanic element. It consists of two liquids: amalgamated copper in a copper sulfate solution within a porous cylinder, and zinc in a sulfuric acid solution surrounding the cylinder. Polarization is eliminated through the deposition of metal freed by hydrogen from the copper sulfate.
Encyclopedia entry (1928–1936)
Daniell Element, represents a constant, non-polarizing galvanic element (see). Polarization in the D. e. is eliminated by the following method. The D. e. is an element with two liquids, in which amalgamated copper is placed in a copper sulfate solution poured into a porous cylinder, and zinc is placed in a sulfuric acid solution surrounding the porous cylinder. When the element is closed, dissolution of zinc in the acid and deposition of free copper on the copper plate occurs, copper being freed by hydrogen from the copper sulfate. Thus, deposition of metal occurs, by means of which polarization is eliminated.
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Cite this page
“Daniell Element.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/daniell-element/