Accession Number:


The device is encased in a wooden box with a glass top. Under the glass top is a large horse-shoe shaped metal object, possibly a magnet. In the centre of this horseshoe are the mechanics of the device, including a needle system. The needle points to an unmarked scale near the top of the device, the rounded end of the horseshoe. Above the scale is written “RES. 275.2 OHMS”. Below the plate on the front of the device is a screw, above which is stamped “0”, and below “CORRECTION”. At the top of the device are two terminals with threaded caps. Two short wires emerge from the top left side.

Alternative Name: Ammeter, D’arsonval/Weston Galvanometer

Primary Materials: Wood, Metal


On the front of the device is a metal plate reading “Made by the WESTON ELECTRICAL INSTRUMENT CO., Newark, N.J., U.S.A.”, “Patented”, “Nov. 6, 1886, May 14, 1889, Apr. 29, 1890, Feb. 17, 1891, Dec. 19, 1893, Oct. 4, 1898, Jul. 18, 1901.”, “MODEL 324”, “No. 134”. On the left side of the device is written (in paint(?)) the numeral “II” and the letter “E”.

Dimensions (cm):

Height = 8.5 cm, Length = 18 cm, Width = 10 cm

Function: Measuring electrical current.


Associated Instruments:

Manufacturer: Weston Electrical Instrument Company

Date of Manufacture:


From the collection of Professor Martin Lee.

Historical Notes: