Image: Senator John Heinz History Center - IMG 7824
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Description: Exhibit in the Senator John Heinz History Center, 1212 Smallman Street, Pittsburgh, Pennsylvania, USA. There were no restrictions on photography in the museum collections. Thacher cylindrical slide rule, circa 1890; patented in 1881 by Edwin Thacher (1839-1920).
Title: Senator John Heinz History Center - IMG 7824
Credit: I took this photograph.
Author: Daderot
Permission: Public domain.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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