Object is a Model 4-T dual-base log log vector hyperbolic aluminum slide rule. The slide was inding and has been removed.
Pickett & Eckel, Inc.
Chicago, Illinois, U.S.
||Etched on end of slide.
||Donor's ID number for rule on a gummed label
overall: 2 1/2 in x 12 1/4 in x 1/4 in
Gift of Mike Konshak