The object consists of a slide rule and case. Scratched into the metal plate at one end of the slide rule reads "WA Ballantyne". On the inside flap of the case there is writing that is illegible due to wear.
Manufacturer
Keuffel & Esser Company
Place Manufactured
U.S.
Identifying Numbers
Model number
4083-3
Other number
S557
Donor's ID number for rule
Serial number
216830
Dimensions
in case: 1 in x 13 in x 2 1/2 in; overall: 3/8 in x 12 1/2 in x 2 in
