Object is a large slide rule with the title "SHORT BASE TRIANGULATION SLIDE RULE" at the top, and the letters U.S. at the top right. Scratched into the wood at the Bottom edge are the letters USBR.
Keuffel & Esser Company
||Donor's ID number for rule on gummed label
overall: 2 in x 21 3/4 in x 3/4 in
Gift of Mike Konshak