General Information

Serial #

20891

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

Non ferrous metal case/ metal scale/ glass window.

Dimensions

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

Length

N/A

Width

8.3 cm

Height

3.2 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Communications

Category

Radio

Sub-Category

N/A

Manufacturer

AKA

General Radio

Country

Canada

State/Province

Unknown

City

Unknown

Context

Country

North America

State/Province

Unknown

Period

1930-1940

Canada

Unknown

Function

Measures electrical current in amperes. Was used to measure radio frequency energy coupled from a transmitter to an antenna.

Technical

RF ammeter design prior to thermocouple and milliammeter design. Probably moving iron technology, flush type panel AC ammeter. Popular model used in a lot of General Radio equipment etc. The pointer is very thin and the arrow is perforated allowing for good legibility from several meters away. The pointer is balanced in a very inexpensive way using a piece of sheet metal. The construction looks rugged.

Area Notes

Unknown

Details

Markings

Printed on face: 'AMPERES/ GENERAL RADIO CO./ MODEL 127A/ NO. 20891' ; 'R187' is written and scratched onto the back.

Missing

N/A

Finish

Dull black enamel case. Back of case, natural metal. Scale. silver colour with black printing.

Decoration

N/A