Adder or Differential Gear from the Bush Differential Analyzer


This steel and brass component served as an adder, it connected two shafts, a and b, whose sum c = a + b was to be obtained. The adder consists of a differential gear. The gear ratio was chosen so that the sum of the revolutions of shafts a and b would equal a revolution of shaft c.

Parts of Bush differential analyzer at NMAH have museum numbers MA.314824 and 1983.3002.01 through 1983.3002.89.

Date Made: ca 1930ca 1930

Maker: Bush, Vannevar

Location: Currently not on view

Place Made: United States: Massachusetts, Cambridge

Subject: Mathematics


See more items in: Medicine and Science: Mathematics, Mechanical Integrators and Analyzers, Science & Mathematics


Exhibition Location:

Credit Line: Gift of Wayne State University, College of Liberal Arts, Computation Laboratory

Data Source: National Museum of American History

Id Number: 1983.3002.02Nonaccession Number: 1983.3002Catalog Number: 1983.3002.02

Object Name: differential analyzer component

Physical Description: steel (overall material)brass (overall material)Measurements: overall: 7.8 cm x 8 cm x 8 cm; 3 1/16 in x 3 5/32 in x 3 5/32 in


Record Id: nmah_693233

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.