Gilson Midget Circular Slide Rule
date: label: date made
content: ca 1942
name: label: maker
content: Gilson Slide Rule Company
notes: label: Description
content: This circular calculating rule is made of an aluminum disc 4-1/4" in diameter. The disc has a white plastic coating on both sides. There are two green transparent plastic indicators on the front and one indicator on the back. A metal screw and two supports hold the instrument together. The scales and markings are exactly like those on 1998.0119.01. A green synthetic leather case is marked in ink inside the flap: MATLACK.
label: Description
content: The scales are also similar to those on 1979.0816.01, the Binary Slide Rule of Gilson Slide Rule Company of Stuart, Fla. Gilson manufactured slide rules under U.S. patent 1,404,019, issued to Clair A. Gilson for a "Mechanical Calculating Device" on January 17, 1922. The company was known for not putting its name on its products, which were resold by several American dealers of mathematical instruments.
label: Description
content: The donor, Dr. Albert S. Matlack, purchased this object around 1942, when he was an undergraduate at the University of Virginia. He also used it as a research chemist at the Hercules Research Center in Wilmington, Del.
label: Description
content: Reference: Accession file.
label: Location
content: Currently not on view
place: label: place made
content: United States: Florida, Stuart
topic: label: Subject
content: Rule, Calculating
label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
label: See more items in
content: Slide Rules
creditLine: label: Credit Line
content: Gift of Albert S. Matlack
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1989.0032.01
label: catalog number
content: 1989.0032.01
label: accession number
content: 1989.0032
objectType: label: Object Name
content: calculating rule
label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: plastic (cursor material)
label: Physical Description
content: cloth (case material)
label: Physical Description
content: aluminum (overall material)
label: Measurements
content: overall: 12 cm x 12 cm x .5 cm; 4 23/32 in x 4 23/32 in x 3/16 in