General Information

Serial #

57988

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

Metal casing/ Glass/ Bakelite base/ Paper.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

11.7 cm

Width

11.7 cm

Height

N/A

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Energy-electric

Category

Measurement

Sub-Category

N/A

Manufacturer

AKA

Weston

Country

United States of America

State/Province

New Jersey

City

Newark

Context

Country

Unknown

State/Province

Unknown

Period

Unknown

Canada

Example of precision milli-ammeter used at NRC.

Function

To measure DC current.

Technical

Miniature portable precision milli-ammeter used for laboratories, school labs, garages and general testing. Shielded from external magnetic fields. Permanent Magnet Movable Coil type ammeter. Horizontal reading. Fan-shaped. Fan-shaped instruments are designed to have very long scales while keeping the case compact. Weston claims that its fan-shaped meters have the longest scales in the world relative to their size.

Area Notes

Unknown

Details

Markings

Markings found on contact points: "0.75 Amp [on left negative cap]"/ "+ [on right positive cap]" Mfr. plate reads: "WESTON MIL-AMMETER/ PATENTED/ JUL. 10, '94 NOV. 20, '94/ JAN. 29, '95 OCT. 4, '98/ JUL. 16, '01/ OTHER PATENTS PENDING/ MODEL 280/ No. 57988/ WESTON ELEC. INST. CO. NEWARK, N.J., U.S.A." Markings on brass-coloured center screw: "CORRECTOR" Typed scale found on back of ammeter reads: "100 97.8/ 200 197.9/ 300 299.9/ 400 396.8/ 500 502.5/ 600 603.9/ 700 704.4/ 750 754.4" NRC label on back of ammeter reads: "NATIONAL RESEARCH COUNCIL/ APPLIED MI8 [WRITTEN IN PENCIL] PHYSICS/ INSTRUMENTAL OPTICS"

Missing

N/A

Finish

Black.

Decoration

N/A