General Information

Serial #

102827

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

Metal (steel and brass?)/ Glass/ Paper/ Bakelite?

Dimensions

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

Length

22.9 cm

Width

28.0 cm

Height

12.7 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Energy-electric

Category

Measurement

Sub-Category

N/A

Manufacturer

AKA

Roller Smith

Country

United States of America

State/Province

Pennsylvania

City

Bethlehem

Context

Country

Unknown

State/Province

Unknown

Period

Unknown

Canada

Early example of AC switchboard meter for the power industry. American model is good comparison with equivalent Canadian made models of the same range in our collection (1967.0123).

Function

To measure AC current in amperes.

Technical

Moving iron type Switchboard Edgewise AC ammeter. One of the ammeter's first practical applications was in the electrical industry of the early 20th C. to regulate the flow of electricity. With business booming, there was a large demand for a voltmeter or ammeter that could be mounted on a switchboard to keep track of the electricity. Popular style on switchboards where many meters need to be stacked vertically. This form appeared before the turn of the century and remained popular for decades afterwards. Since the large black pointer is far from the scale, parallax errors could be quite large.

Area Notes

Unknown

Details

Markings

Mfr. plate reads: "ROLLER-SMITH CO./ BETHLEHEM, PA., U.S.A." Markings found on scale reads: "A.C. AMPERES/ TYPE H.E.A./ Roller-Smith Co./ BETHLEHEM, PA./ MADE IN U.S.A./ NO. 102827/ MAX. CURRENT 5 AMPS. CURRENT TRANSFORMER RATIO 300/5 AMPS. "

Missing

N/A

Finish

Artifact is an edgewise ammeter, slightly rectangular with a concave face/ Gauge is half round/ Encased in japanned metal case/ Indicator needle points from top to middle of the scale/ From the back protrude 2 brass screws (terminals) 4" long, with a nut & washer each/ Meter is in working order.

Decoration

N/A