Ammeter

Physics

Accession Number: 2009.ph.173

Description:

The ammeter is a metal cylinder with an attached metal bottom. The top face is covered with glass. The top shows a needle and scale. The scale runs froom 0-11, with additional marks halfway between the whole numbers. The needle is fixed to a point in the middle of the face. A torn label on the top of the glass, directly above the lower writing, is written in pen. It reads “Operate at [blank] constant cu[blank] of 5.5 amperes”. Over top of “5.5” is written in pencil “6.5”. Two collumns 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.

Alternative Name:

Primary Materials: Metal, Glass

Markings:

Old inventory number = phy369. Above the needle, below the scale, reads “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

Function:

A device used to measure amperage in an electrical circuit.

Condition:

Associated Instruments:

Manufacturer: Deprez & Carpentier, Paris, France

Date of Manufacture:

Provenance:

From the collection of Professor Martin Lee.

Historical Notes: