Noun
Daniell cell (plural Daniell cells)
English Wikipedia has an article on:Daniell cellWikipedia
An early battery consisting of a copper pot filled with a copper sulphate solution, in which was immersed an unglazed earthenware container filled with sulphuric acid and a zinc electrode.
Another method of making the test was by connecting the electrodes of a capillary electrometer to the two poles of a Daniell cell with a sulphate of cadmium solution. Source: Internet