ball and track
Date1900-1920
Inventory Number0352
ClassificationElectromagnetic Apparatus
Subject
Maker
American
?
User
Department of Physics, Harvard University
founded 1884
Cultural Region
Place of Use
Dimensions8.4 × 43 × 16.3 cm (3 5/16 × 16 15/16 × 6 7/16 in.)
Material
Accessoriesmetal balls (2)
DescriptionThe track consists of two brass angles 3/4" apart and intended for a ball somewhat larger to roll back and forth along the track when an electric current is completed through the ball and the tracks. The brass angle tracks are mounted on a heavy mahogany base with a leg support of brass at one end and a leveling screw at the other. Binding posts mounted on each angle track. There are two accompanying metal balls.
The painted "e.m" indicates a circa 1920s use in Jefferson lecture demonstration set-up room at Harvard.
The painted "e.m" indicates a circa 1920s use in Jefferson lecture demonstration set-up room at Harvard.
Signedunsigned
Inscribedon instrument: E.M.
stamped old Harvard number: 20 26
FunctionFor experimentation with electrostatics.
ProvenanceFrom the Department of Physics, Harvard University.
Walter Balcke
Date: 1952-1964
Accessories: mahogany box; cardboard instruction card
Object number: 1997-1-1601
Walter Balcke
Date: 1952-1964
Accessories: mahogany case; two circular protractors; clear plexiglass rule with serated edge
Object number: 1990-5-0028
Rudolph Koenig
Date: circa 1865
Object number: 1997-1-0892d
Rudolph Koenig
Date: circa 1865
Object number: 1997-1-0892c
Rudolph Koenig
Date: circa 1865
Object number: 1997-1-0892g
Rudolph Koenig
Date: circa 1865
Object number: 1997-1-0892b
Rudolph Koenig
Date: circa 1865
Object number: 1997-1-0892e
Rudolph Koenig
Date: circa 1865
Object number: 1997-1-0892f
Rudolph Koenig
Date: circa 1865
Object number: 1997-1-0892h
Keuffel & Esser Company
Date: circa 1925
Accessories: case
Object number: 1997-1-1917