General Information

Serial #

13251

Part Number

1

Total Parts

1

AKA

Telegraph circuit test set

Patents

N/A

General Description

Brass case and meter face. Glass window. Paper scale. Wooden base. Metal binding posts.

Dimensions

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

Length

19.0 cm

Width

7.0 cm

Height

12.5 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Communications

Category

Telegraphy

Sub-Category

N/A

Manufacturer

AKA

Weston

Country

United States of America

State/Province

New Jersey

City

Newark

Context

Country

North America

State/Province

Unknown

Period

1920-1935

Canada

Made for AT & T Co. Typical meter used in Canadian industry.

Function

Used to set up and balance the electric current in a polar telegraph system. Measures small current in milliamperes.

Technical

Relatively accurate permanent magnet movable coil type DC milli-ammeter. The name "mil-ammeter" is unusual. The more common term is milli-ammeter. Late use of ebonite in binding posts. The material was replaced by bakelite for that application in the middle of the 1910's. The meter was screwed to a wooden base which itself has drill holes. This suggests that the base was used to attach the meter to a surface with screws of a larger size than those that could be accommodated by the meter. The needle has a solid black tip, which does not allow for very accurate readings but can be seen from some distance.

Area Notes

Unknown

Details

Markings

Printing on face reads: 'MILLIAMPERES/ A.T.& T. CO./ W.E. CO., NO. 12015/ NO. 13251'; Mfr. plate reads: 'WESTON MIL-AMMETER./ PATENTED/ NOV 6, '88 APR. 29, '90/ FEB. 17, '91 OCT. 4, '98, JUL. 16, '01/ OTHER PATENTS PENDING./ WESTON ELEC. INST CO., NEWARK, N.J., U.S.A./ MODE6 264 NO. 13251/0 CONNECTOR'

Missing

From CA of 10/10/1996 by Kevin Machan: Undetermined

Finish

Meter case, black low gloss enamel. Meter face, white with black calibration, wooden block, clear shellac or varnish.

Decoration

N/A