D.C. ammeter
Datecirca 1921
Inventory Number1997-1-0332
ClassificationAmmeter
Subject
Maker
Weston Electrical Instrument Corporation
founded 1888
Cultural Region
Place of Origin
Place of Use
Dimensions22.7 × 19.7 × 12.3 cm (8 15/16 × 7 3/4 × 4 13/16 in.)
Material
Accessoriesstandardization certificate on inner surface of lid
DescriptionA wooden box with a hinged lid that allows access to its top half. Inside one finds a metal box with an arc-shaped window, the contours of which are outlined by a black metal frame that also forms a semicircle on the exposed part of the instrument (probably a full circle). The frame seems to be decorative.
The scale of the instrument is linear and goes from 0 to 5 (amperes). Over it hovers a very thin needle. There is a reflective band below the scale.
There are two electrical connectors at the top left corner of the metal box, with the rightmost one labelled + by a metal knob on the edge of the wooden box nearby.
The box has a leather strap on its top side that is wearing out.
On the inner surface of the lid is a standardization certificate by the manufacturer. It also has a plaque with maker, location, patent dates, model and maker's numbers but it's hidden from view.
The scale of the instrument is linear and goes from 0 to 5 (amperes). Over it hovers a very thin needle. There is a reflective band below the scale.
There are two electrical connectors at the top left corner of the metal box, with the rightmost one labelled + by a metal knob on the edge of the wooden box nearby.
The box has a leather strap on its top side that is wearing out.
On the inner surface of the lid is a standardization certificate by the manufacturer. It also has a plaque with maker, location, patent dates, model and maker's numbers but it's hidden from view.
Signedon scale: WESTON D.C. AMMETER
on certificate: WESTON D.C. AMMETER MODEL 15, No. 24549.
Inscribedold sticker: CHEMICAL LABORATORIES OF / HARVARD UNIVERSITY / E 243
Curatorial RemarksLock made by Eagle Lock Co. Terryville Conn USA.
FunctionAn ammeter for direct current. It is most likely a galvanometer. Seems to be designed for portability.
ProvenanceFrom the Chemical Laboratories, Harvard University.
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: circa 1913
Object number: 1997-1-0328
Weston Electrical Instrument Corporation
Date: 1900-1930
Accessories: standardization certificate on inner surface of lid
Object number: 1997-1-1183
Weston Electrical Instrument Corporation
Date: 1920-1930
Accessories: standardization card from the A.S. Mancib Co.
Object number: WJ0951
Weston Electrical Instrument Corporation
Date: circa 1922
Accessories: standardization certificate from 1922 inside lid
Object number: 1997-1-0337
Weston Electrical Instrument Corporation
Date: 1901-1930
Accessories: standardization certificate on inner surface of lid
Object number: 1997-1-1101
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: 1901-1930
Accessories: standardization certificate on inner surface of lid
Object number: 2003-1-0038