astatic galvanometer
Date1900-1940
Inventory Number0176
ClassificationAstatic Galvanometer
Subject
User
Department of Chemistry, Harvard University
founded 1791
Cultural Region
Place of Use
Dimensions13.6 × 23.6 × 22.5 cm (5 3/8 × 9 5/16 × 8 7/8 in.)
Material
DescriptionGalvanometer has large coil of wire with a magnet and needle supported on a pin in the center of the coil. Large silvered scale surrounds coil. Scale marked from 0-90-0-90-0. Encased in cylindrical brass case with a glass top and tripod base with three leveling screws. Two binding posts are mounted on outside of case.
Signedunsigned
Inscribedscratched on glass: E118 [old chemistry number]
FunctionThis galvanometer was used in a chemistry classroom. An astatic 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.
The current deflections can be detected using a scale.
The current deflections can be detected using a scale.
ProvenanceFrom the Department of Chemistry, Harvard University, 10/10/1954.
L. E. Knott Apparatus Company
Date: circa 1910
Object number: 0451
L. E. Knott Apparatus Company
Date: 1910-1930
Accessories: bell jar
Object number: 0189a,b
Heinrich Daniel Ruhmkorff
Date: circa 1859
Object number: 0193a,b
