Gabriel Lippmann and the Capillary Electrometer
نویسنده
چکیده
Early workers in the field of potentiometry faced a serious problem. The type of cell commonly used in potentiometric studies could supply only a tiny current and often had a high internal electrical resistance. If the electromotive force (emf) of such a cell is to be measured accurately, the apparatus must draw essentially no current from the cell. One obvious approach is to oppose this emf with another that is exactly equal, and is generated externally. This is the basis of the “compensation method,” devised by Johann Christian Poggendorf in 1841 and later improved by others (1).
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تاریخ انتشار 2007