D.C. Ammeter, Type R

Physics

Accession Number: 2009.ph.160

Description:

The ammeter is set in a square wooden stand, with a simple flat base and a vertical wood panel where the ammeter proper is set. A pair of triangular braces support the vertical piece on either side, sloping backwards. A scale with a needle sits above this; the scale runs from 0-20, calibrated in Amperes. On the back of the ammeter is a factory label detailing guarantee of quality. The back of the ammeter also has both positive and negative terminals, marked with large plus and minus signs, respectively.
Set directly behind the scale is a light bulb.

Alternative Name:

Primary Materials: Wood, Metal, Glass

Markings:

Old inventory number on paper label: “PHY1021”.

The face of the ammeter is engraved and reads “Wagner Electric Mfg. Co.”, “Type R”, “St. Louis, U.S.A.”.

The scale reads “D.C. AMMETER”, “TYPE R”, “No. 24761”.

The back of the wooden stand has written on it, in black ink, “20 Amperes”, “R=0.04 ohms”.

On the back of the ammeter is a factory label detailing guarantee of quality.

Dimensions (cm): Height = 33, Width = 30, Length = 29

Function:

Measuring amperage; possibly a demonstration device.

Condition:

Good: The back of the scale has been cracked and mended; the glue is discoloured. The meter shows signs of use and some corrosion around connections and screws.

Associated Instruments:

Manufacturer:

Wagner Electric Manufacturing Company, St. Louis, Missouri, USA

Date of Manufacture: Early 20th Cent.

Provenance:

Historical Notes: