Artifact Details Title Slide rule Catalog Number 102666588 Type Physical object Description The object consists of a slide rule, brown leather case, and a paper box. Handwritten in red ink on the exterior of the leather case is "Hans Christiansen". Handwritten on the inside flap of the case is "Hans Christiansen Ringgare 108". Manufacturer Diwa Place Manufactured Denmark Identifying Numbers Model number Rietz-Ideal No. 1 Other number S283 Donor's ID number for rule Dimensions in box: 1 1/8 in x 13 1/4 in x 2 5/8 in Category Pre-computer/slide rule Credit Gift of Mike Konshak Lot Number X3741.2007