Our museum is temporarily closed to support the effort to contain the spread of COVID-19. Read a message from our director, and check our website and social media for updates.

Ross Precision Computer Related Documentation

Ross Precision Computer Related Documentation

<< >>
Usage conditions apply
Two copies of an advertising flyer for the Ross Precision Computer, the Ross Meridi-o-graph, and the Ross Rapid Computer were received with 1996.3077.01. The flyer provides photographs and descriptions of the three instruments. It also cites press releases published in Scientific American 114, no. 3, January 15, 1916, and Engineering News 75, no. 21, May 25, 1916.
Also received was a short letter initialed by the inventor of these devices, Louis Ross, and addressed to Roy Kegerreis of New York City. The letter, dated July 31, 1918, notes the availability of the instruments and offers them on a trial basis. Enclosed were a 3-1/4" by 6-1/2" printed note addressed "To Men in the Army and Navy," describing the suitability of the instruments for military purposes. A second printed note, of the same size, announced the addition of trigonometric scales to the Precision Computer even though the price remained at $20.00.
Currently not on view
Object Name
date made
Computer Manufacturing Company
place made
United States: California, San Francisco
Physical Description
paper (overall material)
overall: 18.3 cm x 15 cm x.2 cm; 7 7/32 in x 5 29/32 in x 3/32 in
ID Number
nonaccession number
catalog number
Credit Line
Gift of B.K. Lunde, in memory of Roy Kegerreis
Rule, Calculating
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Slide Rules
Data Source
National Museum of American History
Nominate this object for photography.   

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.


Add a comment about this object