Kohlraush spring ammeter
Date1890-1910
Inventory Number0220
ClassificationAmmeter
Subject
Maker
Hartmann & Braun AG
1879 - 1999
User
Department of Physics, Harvard University
founded 1884
Cultural Region
Place of Origin
Place of Use
Dimensions23.2 × 10.5 × 10.5 cm (9 1/8 × 4 1/8 × 4 1/8 in.)
Material
DescriptionKohlraush spring ammeter consisting of a coil of about 64 turns of heavy wire into which is drawn an armature against a spring. The scale runs from (0 - 25) amperes above the coil in a vertical metal tubular case. The instrument is mounted on a round wooden base.
Signedtube marked: HARTMANN & BRAUN / FRANKFURT A/M
Inscribedbase marked: Kohlraush. N° 594
FunctionMeasurement of electric current.
ProvenanceFrom the Department of Physics, Harvard University.
