Direct Current Ammeter

Physics

Accession Number: 2009.ph.165

Description:

The ammeter is mounted on a wooden base, with a vertical wooden back panel as well. Also on the face is a small plaque detailing patent information. The top scale is calibrated in micro-amperes, and runs from (-100) to 100. The scale is further labeled “MICROAMPERES D.C.” The back of the ammeter has a light socket, without a bulb, ostensibly for lighting the scale face. To either side of the light bulb lies a battery terminal.

Alternative Name:

Primary Materials: Wood, Metal, Glass

Markings:

Old inventory number = phy1026A-B. The front of the ammeter is inscribed with “WESTON STATION AMMETER, NO. 10868”, “MADE BY WESTON ELECTRICAL INSTRUMENT CO., NEWARK, N.J., U.S.A.”.

Written in ink on the wooden panel at the back of the object: “R = 1300 Ω j.s.”

Scraped into the top of the wooden panel: “PHYSICS”

Dimensions (cm): Height = 36, Width = 33, Length = 24

Function:

Measuring amperage in an electrical circuit; possibly a demonstration device.

Condition:

Good. There is some slight corrosion on the metal. The edges of the wood is slightly damaged.

Associated Instruments:

Manufacturer:

Weston Electrical Instrument Company, Newark, New Jersey, USA.

Date of Manufacture: Early 20th Cent.

Provenance:

Historical Notes: