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Ammeter (Deprez & Carpentier)


The ammeter is a metal cylinder with an attached metal base. On one side of the base there is a key-hole shaped hole for a hook.

The top face is covered with glass. On the face, which is paper, there is an arc-shaped scale and an indicator needle affixed to a central dial . The scale runs from 0-11, with additional hand-written marks halfway between the whole numbers.

A paper sticker is affixed to the glass cover. It reads “Operate at [blank] constant cu[blank] of 5.5 amperes”. Over top of “5.5” is written in pencil “6.5”. Two columns run below this, one reading “Scale”, the other “Corr’d”. Written in pencil perpendicular to these lines is “N.G.” and “Recalibrate”. On either side of the cylinder is a threaded terminal with nut. The bottom plate of this device is loose.

Accession Number:

Alternative Name:

Primary Materials:

Metal: Copper Alloy, Metal: Iron Alloy, Glass, Paper


Old inventory number = phy369.

Above the needle, below the scale, is written in cursive script: “Amperes-Metre”, “Deprez et Carpentier”, “Bte s.g.d.g.”. Below the needle is written “J. Carpentier, Jngr. Constr.”, “Paris”, “J6 (?) 11153”. Under this is written “W.L. Argo”, “W.A. Davidson”, and beside both is written “10/12/10”, although the latter has been crossed out with pencil. On the left side of the cylinder is written (in paint?) the numeral “II” and “E”.

On the bottom of the ammeter is a paper label reading “Ammeter #11153”, “Feb.21/21”.

Dimensions (cm): Height = 6.5 cm, Diameter = 12.5 cm


A device used to measure electrical current in amps in an electrical circuit.


Good: The metal case of the instruments is blotchy with dark marks, suggesting oxidation, and the base is scratched. The stickers affixed to the top and base of the case are dirty and torn on the corners; the one on the top shows water damage across its surface. The glass cover is dirty, but intact.

The face of the instruments appears to have been replaced. The scale and writing on the cover does not match similar instruments, and is not correctly centred.

Associated Instruments:

Manufacturer: Deprez & Carpentier, Paris, France

Date of Manufacture: 1878-c.1900


From the collection of Professor Martin Lee.

Additional Information and References:

Historical Notes: