Graphic Calculator Pumping Percentage Circular Slide Chart for Calgon
date: label: date made
content: 1959-1963
name: label: maker
content: Graphic Calculator Co.
notes: label: Description
content: This circular slide chart consists of two plastic discs of equal size held together at the center by a metal rivet. The bottom disc is white, with a green logarithmic scale around the edge that runs from 8 to 20. The top disc is clear around the edge (making it possible to see the lower scale) and gray in the center. Around the gray region is a circular logarithmic scale that also runs from 8 to 20. According to the instructions on the object, one rotates the upper disc to set the pumped weight on the inner scale opposite the green weight on the outer scale. The “Percent Pump” can then be read through a window in the upper disc. It ranges from 0 to 20.
label: Description
content: The green weight of a processed food is the weight before processing, while the pumped weight is weight after processing. This device allows one to find the percentage by which the weight of a product has increased as a result of processing. USDA regulations require that, if the pumped weight of a meat product exceeds the green weight, the substances added be indicated.
label: Description
content: The top disc is marked: PUMPING (/) PERCENTAGE (/) CALCULATOR. It is also marked: CURAFOS. It is also marked : CALGON CO. (/) PITTSBURGH 30, PENNSYLVANIA. On the bottom disc is marked: Copyright 1959 Hagan Chemicals & Controls, Inc. It is also marked: MANUFACTURED BY (/) GRAPHIC CALCULATOR CO., CHICAGO 5, ILL.
label: Description
content: Graphic Calculator Company was a slide rule manufacturing and design company founded in Chicago in 1940 by Capron R. Gulbransen and apparently still in business at the time of his death in 1969. Curafos was the trademark for a chemical compound used in the treatment of meat and meat products to improve their color and moisture retention. The chemical was introduced by CALGON Co. in 1953, with the trademark granted in 1955. CALGON was a subsidiary of Hagan Corporation until 1956, when Hagan Corporation was renamed Hagan Chemicals and Controls. In 1963, Hagan Chemicals and Controls sold its Controls Division to Westinghouse, and the remaining firm became Calgon Corporation. These changes in corporate name are consistent with the copyright date of 1959 on the instrument.
label: Description
content: References: <i>Processing Inspectors’ Calculations Handbook</i>, United States Department of Agriculture Food Safety Inspection Service, rev. ed. (Washington, DC, 1995), 83, http://www.fsis.usda.gov/OPPDE/rdad/FSISDirectives/7620-3.pdf; Obituaries, <i>Chicago Tribune</i>, August 11, 1969, p. A6.
label: Location
content: Currently not on view
place: label: place made
content: United States: Illinois, Chicago
topic: label: Subject
content: Rule, Calculating
label: Subject
content: Food Processing
label: Subject
content: Mathematics
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 Cincinnati Boss Company
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2000.3029.13
label: nonaccession number
content: 2000.3029
label: catalog number
content: 2000.3029.13
objectType: label: Object Name
content: calculating rule
label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Physical Description
content: metal (part material)
label: Measurements
content: overall: 10.2 cm x 10.2 cm x .1 cm; 4 1/32 in x 4 1/32 in x 1/32 in