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.

Range Correction Chart, Felsenthal FAS-3

Range Correction Chart, Felsenthal FAS-3

Usage conditions apply
This white plastic chart was designed for the U.S. Army Signal Corps. It is a nomogram for finding the range correction in yards of a weapon, by lining up the meteorological correction as a percentage of the range and the range.
On the left is a scale marked “Range Correction in Yds.” On the right is a scale marked “Percentage Meteorological Correction” and on the diagonal between the two is a scale marked “Range in Yds.” According to a label received with the object and stored in the accession file, the object was made in 1945.
The meteorological correction is found from the temperature and wind speed using a related chart called a “sound velocity corrector” (for an example, see 1977.1141.42).
A mark on the object reads: Range Correction Chart PT-63/TSS-1.
For an explanation of the mathematical theory of this kind of nomogram, see Lipka. For a similar device used for another purpose, see 1985.0636.01.
Joseph Lipka, Graphical and Mechanical Computation. Part I. Alignment Charts, New York: John Wiley & Sons, 1921, pp. 65–
Accession file.
Currently not on view
Object Name
date made
G. Felsenthal & Sons
place made
United States: Illinois, Chicago
Physical Description
plastic (overall material)
overall:.1 cm x 26.6 cm x 20.3 cm; 1/32 in x 10 15/32 in x 8 in
ID Number
catalog number
accession number
Credit Line
Gift of Ben Wharton Rau and Margery Felsenthal Rau
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Mathematical Charts and Tables
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