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This paper presents data on a modified cadmium sulfate saturated standard cell of the Vosburgh type in which a tertiary amalgam containing 11.2 percent bismuth and 8.4 percent cadmium is used as anode and the double salt, CdSO 4 · Na 2 SO 4 · 2H 2 O is added to the usual CdSO 4 electrolyte in an amount more than sufficient to saturate the solution with the double salt. Crystals of CdSO 4 · Na 2 SO 4 · 2H 2 O are placed over the surface of both electrodes. The emf of the cell, as a function of temperature, is given by    E  (  in volts  )  =  1.018243  +  3.0956  ×    10    -  5    t  -  8.559  ×    10    -  7t  2   +  1.3534  ×    10    -  8t  3   .    At 25 °C the cell has an emf-temperature coefficient of + 13.5 μ V/°C while the conventional saturated cadmium sulfate cell has a dE/dT of -49.4 μ V/°C. Data on the emf-temperature hysteresis of the cell on cooling and on heating are also given in graphical form. Data on the changes in Gibbs energy, enthalpy, entropy, and heat capacity for the cell reaction are given for the temperature range of 5 to 40 °C.

A galvanic cell with a low emf-temperature coefficient