Object Details
maker
G. Felsenthal & Sons, Inc.
Description
This device assists in calculations of changes in the range of a gun because of meteorological conditions, particularly wind speed and temperature. A rotating disc and pointer attached to the plastic base have the scales required to correct for wind speed. A scale toward the bottom of the base gives the temperature correction. Both of these corrections are in percentages of the range. Summing them gives the total meteorological correction as a percentage of the range. One then can use a range correction chart to find the actual range correction.
A mark on the front of the instrument reads: Signal Corps U. S. Army (/) SOUND VELOCITY CORRECTOR PT-62/TSS-1 (/) Order No. 3531-CEGSA-45 G. FELSENTHAL & SONS - CHICAGO.
The instrument was designed and made for the United States Army by G. Felsenthal & Sons of Chicago in 1945. It had Felsenthal designation FAS-2.
For a related range correction chart, see 1977.1141.43.
Reference:
Accession file.
Location
Currently not on view
Credit Line
Gift of Ben Wharton Rau and Margery Felsenthal Rau
date made
1945
ID Number
1977.1141.42
catalog number
336426
accession number
1977.1141
Object Name
calculating disc & chart
chart
Physical Description
plastic (overall material)
Measurements
overall: .1 cm x 26.5 cm x 20.2 cm; 1/32 in x 10 7/16 in x 7 15/16 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_1213917