Historical information

The Weston cell, is a wet-chemical cell that produces a highly stable voltage suitable as a laboratory standard for calibration of voltmeters. Invented by Edward Weston in 1893, it was adopted as the International Standard for EMF between 1911 and 1990.[1]
This is a type of standard cell, which is a battery that produces a precisely known voltage in laboratory conditions at 20 degrees centigrade.[2]

Physical description

Brass cylinder with 4 connections at top. Two marked 'A' and the other two marked 'B'. Black plastic nob in the centre top.
Written at top Weston Normal Cell I-0183 INT VOLTS AT 20 degrees C

Inscriptions & markings

Weston Normal Cell
H Tinsley & Co, London S E
No 50498
No 8910