General Information

Serial #

397652

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

Metal body (cast iron?)/ Glass covered gauge/ Paper scale/Brass binding posts/ Black painted ceramic/ Aluminium pointer.

Dimensions

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

Length

24.0 cm

Width

16.5 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

General Electric

Country

Canada

State/Province

Ontario

City

Unknown

Context

Country

Unknown

State/Province

Unknown

Period

Unknown

Canada

An early ammeter made in Canada by Canadian GE.

Function

To measure DC current in amperes.

Technical

The D7 is a magnetically shielded permanent magnet moving coil type of DC ammeter. The early D7 types were designed for switchboard use. They were constructed using the D'Arsonval principle. "They are neat in appearance, substantial in construction, and unsurpassed in accuracy." Can. GE catalogue 1915-16, p. 855. The ink used in the scale is slightly raised and shiny, increasing legibility. The opening for the dial is very large. This would allow a lot of light in, and make it easier to read the scale in poor lighting conditions as well as from a distance.

Area Notes

Unknown

Details

Markings

Printed on gauge: "AMPERES/ CANADIAN GENERAL ELECTRIC CO./ LIMITED/ TORONTO PETERBORO/ NO.397652 TYPE D-7/ N.P. 8371-B" Raised GE logo found on top surface of ammeter.

Missing

N/A

Finish

Unknown

Decoration

N/A