Three Photographs Related to the GIW Hydraulic Slide Rule

These three photographs relate to the hydraulic slide rule developed for calculations relating to pumps and pipelines at the Georgia Iron Works (2009.0100.01). A snapshot from 1961 shows the slide rule as it was first designed. A second image shows the designer, Danforth W. Hagler, in an office in the 1960s. The third, which is somewhat later, shows Hagler at the console of an IBM 1130 computer. In that photograph, an oversized version of the slide rule he invented is mounted on the wall.
Currently not on view
Object Name
date made
date received
Physical Description
paper (overall material)
part: photo 2: 17.5 cm x 10.7 cm x .2 cm; 6 7/8 in x 4 7/32 in x 3/32 in
part: photo 1: 7.4 cm x 10 cm; 2 29/32 in x 3 15/16 in
part: photo 3: 15 cm x 11.3 cm; 5 29/32 in x 4 7/16 in
place made
United States: Georgia, Grovetown
United States: Georgia, Augusta
ID Number
accession number
catalog number
Science & Mathematics
Rule, Calculating
Slide Rules
See more items in
Medicine and Science: Mathematics
Slide Rules
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Danforth W. Hagler
Additional Media

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