Tinsley universal potentiometer
date: label: date made
content: ca 1920
name: label: maker
content: H. Tinsley & Co.
notes: label: Description (Brief)
content: This alternating current potentiometer consists of a phase shifting transformer, slide wire, and dial resistors. Incorporates a Weston model 18 Electrodynamometer Milliammeter #3857 with an 1898 patent date. It is in a mahogany case; marked “H. Tinsley & Co. / London S.E., England, #1242" and "Tinsley's Universal / Potentiometer". This potentiometer operates on a principle similar to that in the ordinary direct current potentiometer, except that instead of balancing the unknown voltage against a Standard Cell, or a circuit directly controlled by a Standard Cell, it is balanced against a circuit controlled by a Weston Electrodynamometer used as a transfer standard. This in turn is standardized against a Weston Standard Cell by using direct current, since the instrument is accurate on both alternating and direct currents.
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.313274
label: maker number
content: 1242
label: catalog number
content: 313274
label: accession number
content: 181342
objectType: label: Object Name
content: meter
label: Object Name
content: potentiometer
physicalDescription: label: Measurements
content: overall: 7 in x 15 1/2 in x 33 in; 17.78 cm x 39.37 cm x 83.82 cm