D.C. milliammeter
Date1930-1940
Inventory Number1997-1-0705
ClassificationAmmeter
Subject
Maker
Weston Electrical Instrument Corporation
founded 1888
Cultural Region
Place of Origin
Dimensions4.7 × 7.8 × 9.7 cm (1 7/8 × 3 1/16 × 3 13/16 in.)
Material
DescriptionA black metal ammeter with a round face and three large electrical connectors below it, marked from left to right as "LOW", "HIGH" and "+".
Its indicator consists of an arc-shaped scale with two different ranges, one marked above it going from 0 to 150, and the other below it going from 0 to 15. Over it moves a metal pointer with a stylized tip. One can see the instrument's coil near the bottom of the window, which has a large black screw above it for zero adjustment.
Its indicator consists of an arc-shaped scale with two different ranges, one marked above it going from 0 to 150, and the other below it going from 0 to 15. Over it moves a metal pointer with a stylized tip. One can see the instrument's coil near the bottom of the window, which has a large black screw above it for zero adjustment.
Signedbelow scale: WESTON ELECTRICAL INSTRUMENT CORP., NEWARK, N.J., U.S.A. / MODEL 489 No. 2895
FunctionAn ammeter for measuring small electrical currents.
Weston Electrical Instrument Corporation
Date: 1920-1930
Accessories: shunt attached by hooks to electrical connectors on top
Object number: 1997-1-1039
Weston Electrical Instrument Corporation
Date: circa 1924
Accessories: standardization certificate from Jan 7, 1924 inside lid
Object number: 1997-1-1055
Weston Electrical Instrument Corporation
Date: circa 1914
Accessories: multiplier in case of instrument; standardization certificate from the Weston Laboratory, Newark, N.J. Feb.1914 on lid of wooden case
Object number: 0278
Weston Electrical Instrument Corporation
Date: 1901-1920
Accessories: undated standardization certificate on inside of lid
Object number: 1997-1-0325
Weston Electrical Instrument Corporation
Date: 1900-1930
Accessories: standardization certificate on inner surface of lid
Object number: 1997-1-1183
General Electric Company
Date: 1940-1970
Accessories: leather case
Object number: 1997-1-1085
Weston Electrical Instrument Corporation
Date: circa 1890
Object number: 1997-1-1061
Jewell Electrical Instrument Company
Date: circa 1931
Accessories: inside lid is a standardization certificate from Oct. 16, 1931.
Object number: 1997-1-0334
Weston Electrical Instrument Corporation
Date: circa 1922
Accessories: standardization certificate from 1922 inside lid
Object number: 1997-1-0337