Pickett N15-T Hydraulic Duplex Slide Rule for Georgia Iron Works
date: label: date made
content: 1961
label: date received
content: 2009
name: label: maker
content: Pickett & Eckel, Incorporated
notes: label: Description
content: From the 1650s people have devised special-purpose slide rules for tasks such as carpentry and tax collection. In 1961 Danforth (Danny) W. Hagler of the Georgia Iron Works Company in Augusta, Ga., designed this slide rule to replace the 100-page notebook of graphs carried by each GIW engineer. GIW also distributed the rule to customers to assist with ordering and operating pumps and pipelines. Pickett & Eckel, the California slide rule manufacturer, assisted with the design and produced the slide rules. For Pickett company history, see 1998.0119.02 and 2000.0203.01.
label: Description
content: This ten-inch, two-sided white aluminum instrument has metal endpieces and a nylon cursor with white plastic edges. The front has logarithmic scales for calculating the kinetic energy and flow rate of a liquid or slurry moving through a pipeline. The top of the base is marked: HYDRAULIC SLIDE RULE (/) GEORGIA IRON WORKS CO. (/) EST. 1891 (/) AUGUSTA GEORGIA. The left end of the slide has a GIW logo. The right end of the slide has the triangular Pickett logo used between 1958 and 1962 and is marked: 338. The bottom of the base is marked: DESIGNED BY D. W. HAGLER.
label: Description
content: The back has logarithmic scales for determining the head produced by a pump, impeller peripheral speed, brake horsepower, and specific speed. Standard C and D scales were added around 1969. The right end of the slide is marked: PICKETT (/) MODEL N 15-T (/) 337. The rule fits in an orange leather case with a belt loop. The front of the case is marked: HYDRAULIC SLIDE RULE (/) GIW (/) D. W. HAGLER (/) Pickett. The case fits inside a redwood box.
label: Description
content: This particular rule was Hagler's personal example of the instrument in production. GIW was his family's business, and his brother, Tom, wrote an instruction manual for the rule (2009.0100.02). Hagler went on to work on computer software for production control. He sold his interest in GIW in 1986.
label: Description
content: References: Helen Callahan, <i>Georgia Iron Works: The First 100 Years</i> (Columbia, S.C.: The R. L. Bryan Company, [1991]), 46–49; Michael V. Konshak, "Developing the Georgia Iron Works Hydraulic Slide Rule: Negotiating with Pickett & Eckel to Make a Special Slide Rule," <i>Journal of the Oughtred Society</i> 19, no. 2 (2010): 33–37; accession file.
label: Location
content: Currently not on view
place: label: place made
content: United States: California, Alhambra
topic: label: Subject
content: Mathematics
label: Subject
content: Rule, Calculating
label: Subject
content: Engineering
label: Subject
content: Manufacturing
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Science & Mathematics
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content: Slide Rules
creditLine: label: Credit Line
content: Gift of Danforth W. Hagler
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2009.0100.01
label: accession number
content: 2009.0100
label: catalog number
content: 2009.0100.01
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: aluminum (overall material)
label: Physical Description
content: plastic (cursor material)
label: Physical Description
content: leather (case material)
label: Physical Description
content: wood (case material)
label: Measurements
content: box: 6.5 cm x 35.5 cm x 10.5 cm; 2 9/16 in x 14 in x 4 1/8 in