astatic galvanometer with moving magnet
Datecirca 1920
Inventory Number0170
ClassificationAstatic Galvanometer
Subject
Maker
American
?
User
Department of Physics, Harvard University
founded 1884
Cultural Region
Place of Use
Dimensions21 × 14 × 14 cm (8 1/4 × 5 1/2 × 5 1/2 in.)
Material
DescriptionGalvanometer with suspended U-shaped moving magnet contained in circular glass-topped wooden case with glass observation window on one side for viewing suspended magnet. Five screws are attached to outside of wooden case. Case has circular paper scale and needle for measuring deflection with brass suspension tube projecting vertically from center of scale. Scale marked 0-90-0-90-0. Case is mounted on brass tripod base with three leveling screws. Paper scale similar to 0172, 0174 and 0176.
Old numbers within a blue triangle (on wooden case) indicates use at Harvard in the Physics 3 course in late 1920's.
Old numbers within a blue triangle (on wooden case) indicates use at Harvard in the Physics 3 course in late 1920's.
Signedunsigned
FunctionThis galvanometer was intended for classroom use. 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 Physics, Harvard University, 11/19/1956.
L. E. Knott Apparatus Company
Date: circa 1910
Object number: 0451
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
