Talk:Clark cell

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The voltage and temperature dependence are given differently at different sources. My old CRC handbook from 1945 says 1.4328 volts at 15 deg C, with temperature equation 1.4328[1-0.00119(t-15)-0.000007(t-15)²] volt. This gives a temperature variation of 1.7 millivolt for a 1 dec C temp change from 15 deg C.

A website http://humboldt.edu/~scimus/Instruments/Elec-Duff/StdCellDuff.htm says " 1.434 volts at 15°C. and for a temperature t , an e.m.f. of [1.434 - 0.0012 (t - 15)] volts." which looks like a temperature variation of 1.2 millivolts for a 1 deg C variation.

A website http://chem.ch.huji.ac.il/~eugeniik/history/clark.html which references the above site says 1.4328 volts, but with a temperatuure variation of E_t= E_{15 deg} (1 - 0.00077(t - 15)) which looks like a temperature variation of 1.1 millivolts for a 1 degree C temperature variation.Edison 17:45, 21 July 2006 (UTC)

[edit] Confusing electrode discussion

The article states that one drawback of this type of cell is "corrosion problems caused by the platinum electrodes alloying with the zinc amalgam connections where they enter the glass envelope." But the discussion of the cell itself describes the electrodes as "a zinc amalgam anode and a mercury cathode". Where are these platinum electrodes? DMacks 19:16, 12 December 2006 (UTC)