Hansen Writing Ball Patent Model

This typewriter patent model accompanied the patent application of Hans R. Malling J. Hansen of Copenhagen, Denmark in his patent application that received patent number 125,952 on April 23, 1872. The model only shows a portion of the machine, with three letters in the “type-ball.” This patent was one of the earlier designs of Hansen’s unique writing ball typewriter. In his patent Hansen claimed the combination of converging types arranged circularly that met at the same point. Hansen also claimed the use of a spring or electro-magnet as a means of paper carriage movement. The electromagnet in the typewriter operated by closing the circuit on each descent of the type before it makes it impression on the paper. Closing the circuit causes an attraction of the armature of the magnet, moving the drum before the type hits. After the drum moved a full line, the mechanism would move it down a line.
Currently not on view
Object Name
patent model, typewriter
date made
patent date
Hansen, Hans R. M. J.
Hansen, Hans R. M. J.
Physical Description
mahogany (overall material)
overall: 5 in x 12 1/2 in x 10 in; 12.7 cm x 31.75 cm x 25.4 cm
associated place
Danmark: København, Copenhagen
ID Number
catalog number
license number
accession number
patent number
Computers & Business Machines
See more items in
Work and Industry: Mechanisms
Data Source
National Museum of American History, Kenneth E. Behring Center
Additional Media

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