Humboldt State University ® Department of Chemistry
Robert A. Paselk Scientific Instrument Museum
Standard Cell, Weston model 4
Weston Inst. Div. of Daystrom Inc.
Humboldt College; 1960
Cd(Hg) | CdSO4(aq), Hg2SO4 | Hg.
standard, the Clark cell. It also had the advantage of producing a voltage very near to one volt: 1.0183 V. In 1911 the Weston Saturated Cadmium Cell became the International Standard for electromotive force. Weston waved his patent rights shortly afterword so anyone was allowed to manufacture it.1
Early/contemporary descriptions of the features of the standard cell and its use are provided below:
This standard cell is described as item 79435-37 "Weston Model 4 Cell, Unsaturated" on pg. 703 of the Cenco Catalog J-300 from the Central Scientific Co. (1960) It is also shown as item 19850 on pg 185 of the Braun-Knecht-Heimann-Co. div of Van Waters & Rogers, Inc, Catalog No. 63 (©1961). The same cell, with the same catalog number, is also shown in previous BKH catalogs back to a least as early as 1929 (Catalog No. 29).