ID:
2067
Maker's Name:
Willard Storage Battery Co., Cleveland, Ohio, USA
Where made:
USA
circa 1927
The Willard Colloidal Rectifier has two electrodes, one aluminium and the other probably lead, immersed in a solution of ammonium phosphate with other chemicals to optimise the process (see patent).
This one has never been used so that a sample of the chemicals are still in the original paper bag inside the glass container.
These rectifiers were used, connected directly to 110VAC mains, for charging 'B' (typically 90-135V) batteries for radios.
