Sargent-Welch Model 0253 Projection Slide Rule
date: label: date made
content: ca 1968
name: label: maker
content: Sargent-Welch Company
notes: label: Description
content: This clear plastic slide rule was designed to introduce students to the instrument using an overhead projector. The base of the rule has an A scale (logarithmically divided from 1 to 10 twice) and a D scale (logarithmically divided from 1 to 10). The slide has a B scale adjacent to the A scale and similarly divided, and a C scale adjacent to the D scale and divided like it.
label: Description
content: A mark on the upper left of the base reads: The Sargent-Welch Company (/) 7300 N. Linder Ave., Skokie, Ill. 60076 U.S. A. A mark on the upper right of the base reads: Cat. No. 0253.
label: Description
content: The Welch Scientific Company, an Illinois instrument dealer, offered slide rules in its catalogs from at least the 1930s. These often were made by other companies. The firm moved from Chicago to Skokie in 1960. As early as 1965, Welch advertised this projection slide rule as number 0253 in its catalog, selling it for $7.50.
label: Description
content: In 1968, Welch merged with E. H. Sargent Company to form the Sargent-Welch Company of Skokie, the firms whose mark is on this instrument. Hence the date assigned.
label: Description
content: Many slide rules sold by Sargent-Welch were made by Pickett.A manual copyrighted by Pickett in 1960 and distributed by Sargent-Welcjh lists two projection slide rules made by Pickett and sold by Sargent-Welch. Both of these are considerably more complicated than this instrument. Hence the name of the original manufacturer of the instrument is unclear.
label: Description
content: References:
label: Description
content: Welch Scientific Company, <I>Welch Mathematics Catalog Instruments and Supplies for Teaching Mathematics, </I>, Skokie: Welch Scientific, 1965, pp. 19-22, esp. p. 19.
label: Description
content: Maurice L. Hartung, <I>Pickett Teaching Guide for Slide Rule Instruction</I>, Skokie, Illinois: Sargent-Welch Scientific Company. The copyright date on this manual is 1960, before the formation of Sargent-Welch.
label: Description
content: P. A. Kidwell, A. Ackerberg-Hastings and D. L. Roberts, <I>Tools of American Mathematics Teaching, 1800-2000</I>, Baltimore: Johns Hopkins University Press, pp. 53-68.
label: Location
content: Currently not on view
place: label: place made
content: United States: Illinois, Skokie
topic: label: Subject
content: Mathematics
label: Subject
content: Education
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Slide Rules
creditLine: label: Credit Line
content: Richard J. Zitto
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2010.0235.71
label: catalog number
content: 2010.0235.71
label: accession number
content: 2010.0235
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Physical Description
content: metal (screws material)
label: Measurements
content: overall: .6 cm x 32 cm x 6.5 cm; 1/4 in x 12 19/32 in x 2 9/16 in