reflecting galvanometer with moving magnet
Date1900-1920
Inventory Number0473
ClassificationReflecting Galvanometer
Subject
Maker
American
?
User
Department of Physics, Harvard University
founded 1884
Cultural Region
Place of Use
Dimensions44 x 20.5 x 20.5 cm (17 5/16 x 8 1/16 x 8 1/16 in.)
Material
DescriptionGalvanometer with two pan coils in wooden frames encased in cylindrical blackened brass case with brass suspension tube containing small suspended circular mirror. Case has circular opening with glass viewing window for mirror. Top of suspension tube has a turning brass pointer on a metal scale marked from 0-90-0-90-0. Black iron tripod base with three brass leveling screws.
Signedunsigned
FunctionA reflecting galvanometer is a sensitive instrument that measures small current displacements. When an electric current passes through the wire coil, it induces a magnetic field that causes the coil and the mirror attached to it to rotate in proportion to the current deflections, and the current deflections can be detected using a scale.
ProvenanceFrom the Department of Physics, Lyman Laboratory, Harvard University, 11/1/1968.
American
Date: 1890-1930
Object number: 0155a,b,c,d
American
Date: 1890-1930
Accessories: extra set of coils without multi-tap windings (0156d, e); extra magnet; square wooden case
Object number: 0156a-f
Department of Physics, Harvard University
Date: 1890-1930
Accessories: extra set of coils without multi-tap windings (0156d, e); extra magnet; square wooden case
Object number: 0156a
American
Date: circa 1915
Accessories: Extra case of coils and extra set of magnets (0154d). Three extra magnets (3 bar magnets and 2 bar magnets attached to an aluminum wire) are not numbered because of size.
Object number: 0154a,b,c
