reflecting galvanometer with moving coil
Datecirca 1920
Inventory Number0146
ClassificationReflecting Galvanometer
Subject
Maker
American
?
User
Department of Physics, Harvard University
founded 1884
Cultural Region
Place of Use
Dimensions41 × 14.9 × 14.9 cm (16 1/8 × 5 7/8 × 5 7/8 in.)
Material
DescriptionGalvanometer with banjo-shaped blackened brass case on tripod stand with three leveling screws. Circular coil suspended between the poles of a toroidal magnet with bi-filar suspension. Mirror hung below coil in center of magnets. Front panel of case is detachable.
Old numbers within a blue triangle indicates use at Harvard in the Physics 3 course in late 1920's.
Old numbers within a blue triangle indicates use at Harvard in the Physics 3 course in late 1920's.
Signedunsigned
FunctionThis galvanometer was used in the classroom. A reflecting galvanometer is a sensitive instrument that measures small current displacements. When an electric current passes through a wire coil, it induces a magnetic field that causes the coil to rotate in proportion to the current deflections, twisting a suspended magnet and mirror. The current deflections can be detected using a light beam that reflects off the mirror and onto a scale.
ProvenanceFrom the Department of Physics, Harvard University, 11/6/1956.
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
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: 0156b
American
Date: 1890-1930
Object number: 0155a,b,c,d
Elliott Brothers
Date: circa 1930
Object number: 0232
Electric Manufacturing Company
Date: circa 1883
Object number: 0245
American
Date: circa 1916
Accessories: extra binding posts (2)
Object number: 0141
Siemens, Halske & Company
Date: 1858-1865
Object number: 0179d
Siemens, Halske & Company
Date: 1858-1865
Object number: 0179e