magnetometer
Datecirca 1930
Inventory Number0242
ClassificationMagnetometer
Subject
Maker
Hartmann & Braun AG
1879 - 1999
Supplier
Queen & Company
1893 - 1912
User
Department of Physics, Harvard University
founded 1884
Cultural Region
Place of Origin
Dimensions48.3 × 18.4 × 17.2 cm (19 × 7 1/4 × 6 3/4 in.)
Material
DescriptionLarge bar magnet supported on a bifilar suspension, housed in a flat rectangular case of copper. Black, cylindrical mirror housing above. Glass suspension tube with brass fittings. 3 legged brass base with levelling screws.
Signedback of meter marked: HARTMANN & BRAUN / FRANKFURT A/M;
also marked: SOME AGENTS FOR U.S.A.: / JAMES W. QUEEN & Co. / PHILADELPHIA
FunctionTo measure the strength and direction of magnetic fields. The readings are made by seeing the reflection of a scale through the mirror with a scope.
ProvenanceFrom Harvard University physics department. Blue triangle-indicates use in Physics 3 in the late 1920's
Hartmann & Braun AG
Date: 1900-1920
Accessories: plugs (8)
Object number: 1997-1-0399
Emile Gallemaerts
Date: circa 1911
Accessories: rule; loose screw (see curatorial remarks)
Object number: DW0398
