Westinghouse type 2910 DC ammeter
date: label: date made
content: ca 1892
name: label: maker
content: Westinghouse Electric and Manufacturing Company
notes: label: Description (Brief)
content: This ammeter consists of an instrument with a wooden glass top case mounted on a marble base. Marked: "Westinghouse Elec. & Mfg. Co., Pittsburgh, Pa. #3134". Capacity 600 amperes. In this type ammeter, a soft iron plunger (missing in this specimen) is suspended part way in a solenoid carrying the current to be measured. The plunger is suspended from a pivoted movable system carrying a pointer and controlled by gravity. The electromagnetic field of the solenoid tends to draw the plunger into the solenoid causing the pointer to move over the scale (also missing). The entire current to be measured had to be brought to the switchboard and to the instrument by means of relatively large conductors which procedure is unnecessary in modern ammeters.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Weston Electrical Instrument Corp., thru John H. Miller
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.313285
label: catalog number
content: 313285
label: accession number
content: 181342
objectType: label: Object Name
content: Ammeter
label: Other Terms
content: Ammeter; Measuring Devices
physicalDescription: label: Measurements
content: overall: 6 in x 17 in x 12 in; 15.24 cm x 43.18 cm x 30.48 cm