variable inductor
Date1890-1920
Inventory Number0295
ClassificationInductance
Subject
Maker
Hartmann & Braun AG
1879 - 1999
Supplier
James G. Biddle Company
fl. 1890 - 1950
User
Division of Engineering and Applied Sciences, Harvard University
1946 - 2007
Cultural Region
Place of Origin
Dimensions24.5 x 35 x 25 cm (9 5/8 x 13 3/4 x 9 13/16 in.)
Material
DescriptionFrom Instrument Card: "Moveable coil pivoted to turn inside a fixed coil. Hemisphere above and at right angles to the two coils with a scale of 0-160. Step switch with assorted readings to select various turns of the fixed coil. All mounted on veneered rectangular base with molded edge."
Signedon dial: HARTMANN & BRAUN A.G. / FRANKFURT A.M. / No. 428
Inscribedbase marked: James G. Biddle / Philadelphia; twice marked: PROPERTY OF / HARVARD ENGINEERING SCHOOL; HARVARD UNIVERSITY 1179
FunctionFor experimentation and demonstration of the high voltages induced in a secondary winding when the current in the primary windings is abruptly disrupted.
ProvenanceHarvard University Engineering School, removed to the collection November 1956.
Hartmann & Braun AG
Date: 1900-1920
Accessories: plugs (8)
Object number: 1997-1-0399
