Industrial S-30974 Coulometric Current Source Instrument

Industrial S-30974 Coulometric Current Source Instrument is the Sargent Coulometric Current Source, Model IV, manufactured by E. H. Sargent & Co. of Chicago, as indicated by the model designation and part number. This vintage instrument was designed to provide a stable, constant current for coulometric work and is documented in historical electrochemistry literature as a dedicated current source used during coulometric titration and related experiments. In a published setup, the Model IV delivered currents around 9.65 mA with a 20 cm^2 electrode area, yielding a current density of roughly 0.48 mA/cm^2, illustrating its role in controlling electrolysis in small-volume cells. Archival references describe the device as a purpose-built coulometric current source rather than a general-purpose source measure unit, reflecting mid-century lab instrumentation design for precise current control.