Poggendorf

Siemens W 1857 uber die eiektrostatische induction und die Verzugerung des Stromes in Fiaschendrahten Poggendorfs Ann. Phys. Chem. 102 66-122... 

Kies, F M, P Poggendorf, S Picasso, and V Jager Chem Cominuii, (WA)... 

In the null-point instruments use is made of the well-known compensating method according to Poggendorf, by which the emf of the cell under test is compared with that of a standard cell. The circuit diagram of such a method54 is illustrated in Fig. 2.14. 

The EMF of a galvanic cell is a thermodynamic equilibrium quatity. Thus, the potential of a cell must be measured under equilibrium conditions, i.e. without current flow. The measured EMF must be compensated by a known external potential difference. The measurement of the EMF of a cell is thus based on determination of a potential difference that exactly compensates the measured potential difference so that no current passes. This is easily achieved by the Poggendorf compensation method (see Fig. 3.13). 

V. Jager, R. Muller, T. Leibold, U. Stahl, J. Raczko, B. Steuer, P. Poggendorf, andT. Gracza, Afom Papers XVIth Int Carbohydr. Symp. lUPAC, Paris, July 5-10, 1992, IL-A9. 

Marangoni CGM. Uber die Ausbreitung der Tropfen einer FlUssigkeit auf der Oberflache einer anderen. Ann Phys Chem (Poggendorf) 1871 143 337-354. 

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