Object Details
author
G. Felsenthal & Sons
Description
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.
References:
Joseph Lipka, Graphical and Mechanical Computation. Part I. Alignment Charts, New York: John Wiley & Sons, 1921, pp. 65–
67.
Accession file.
Location
Currently not on view
Credit Line
Gift of Ben Wharton Rau and Margery Felsenthal Rau
date made
1945
ID Number
1977.1141.43
catalog number
336427
accession number
1977.1141
Object Name
chart
Physical Description
plastic (overall material)
Measurements
overall: .1 cm x 26.6 cm x 20.3 cm; 1/32 in x 10 15/32 in x 8 in
place made
United States: Illinois, Chicago
See more items in
Medicine and Science: Mathematics
Mathematical Charts and Tables
Military
Science & Mathematics
Data Source
National Museum of American History
Subject
Mathematics
Link to Original Record
Record ID
nmah_1213752