Dated 1871-1872. From Material relating to experiments designed to measure electromotile forces and electric potential, [1834-1875].

Notes compiled by Charles Wheatstone on the measurement of electric potential in an experimental apparatus consisting of rotating electrodes, and in circuits comprising Standard cells and gas batteries; experimental notes on Standard cells applying an apparently innovatory methodology described by the German physicist, Johann Christian Poggendorf (1796-1877).