ID:
32
Maker's Name:
Weston
Where made:
USA
Dimensions:
12.5 × 8.8 × 11.5 cm
Cadmium Amalgam and Mercury in a saturated solution of Cadmium Sulphate make a cell of reasonably constant voltage, hence used as a standard of EMF in bridges. Initial voltage around 1.018636 Volts. Discarded when voltage drops below 1.0183 Volts. Well-made cells agree within microVolts and should be checked annually against a known stable cell.
Book reference:
Harris F K, Electrical Measurements, John Wiley & Sons, NY, 1952/66, p185.
