Stanley AC-DC ammeter
Datecirca 1895
Inventory Number0422
ClassificationAmmeter
Subject
Maker
Stanley Electric Manufacturing Company
1890 - 1905
User
Department of Physics, Harvard University
founded 1884
Cultural Region
Place of Origin
Place of Use
Dimensions23 × 21.6 × 9 cm (9 1/16 × 8 1/2 × 3 9/16 in.)
Material
DescriptionStanley AC-DC ammeter consisting of a round brass blackened frame for switchboard surface mounting, and a beveled glass face with gold lettering.
The instrument uses hot wire movement and spring tension. There is a magnet damping disc and a nonlinear paper scale running from 0-200 amp, in intervals of 25, with the spaces between the integers becoming larger as the scale increases.
The instrument uses hot wire movement and spring tension. There is a magnet damping disc and a nonlinear paper scale running from 0-200 amp, in intervals of 25, with the spaces between the integers becoming larger as the scale increases.
Signedon face: STANLEY ELECTRIC MFG. CO., / PITTSFIELD, MASS., / U.S.A.
Inscribedon face: 0 24 50 75 100 125 150 175 200 / AMMETER / FOR / ALTERNATING OR DIRECT CURRENT / NO. 3894 / PAT'D APRIL 9, 1895
FunctionMeasurement of alternating or direct currents. Designed to be mounted on a switchboard.
ProvenanceFrom the Department of Physics, Lyman Laboratory, Harvard University.
Weston Electrical Instrument Corporation
Date: circa 1928
Object number: 1997-1-1065
Weston Electrical Instrument Corporation
Date: 1920-1930
Object number: 1997-1-1057
