Archive
of
Collections
Details and Image
| Item# | Type | Model No. | Match No. | Variant No. | Model Name | Maker | Country | Production or Serial No. | Material | Scale Length | Date | Condition |
| KEU532 | Linear | n/a | n/a | n/a | Beatley I-Q | Keuffel & Esser | USA | None | Boxwood w/printed scales | "8" | 1922 | C3 |
Notes: Special slide rule for computing IQ based on chronological age and mental age (presumably measured by tesing). Copyrighted in 1922 by Bancroft Beatley and manufactured by K&E.
Click on the Condition Code to obtain more details.
