Calculating Disc by Felsenthal, Dial-A-Base
date: label: date made
content: 1973
name: label: maker
content: Boyd, George M.
notes: label: Description
content: On September 19, 1972, George M. Boyd of Witchita, Kansas, took out U.S. patent 3,692,238 for this “navigation aid.” It consists of two discs with a slightly larger disc between them, all rotating about a pivot at the center. The outer discs have maps – one of southern Florida, and the other of northern Florida, Georgia, and Alabama. Listed around the rim are the names of air bases in the regions shown. Rotating an outer disc brings up a table of the distance from a given base to all the others. The device also provides such information as the runway patterns of the air bases, cruising altitude rules, and international Morse code. A mark on the object reads: DIAL-A-BASE (/) WITCHTA, KANSAS 67208 (/) PAT. 3692238 (/) 4 JAN 73.
label: Description
content: George Mills Boyd, born in New Jersey, was a Tuskegee Airman, and spent his career in the United States Army (later the U.S. Air Force). He retired from the Air Force in 1971, taking up positions in Kansas.
label: Description
content: References:
label: Description
content: Accession file.
label: Description
content: U.S. Patent 3,692,238.
label: Description
content: Website http://www.wingsoverkansas.com/profiles/a125/, accessed March 28, 2018.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Military
creditLine: label: Credit Line
content: Gift of Ben Wharton Rau and Margery Felsenthal Rau
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1977.1141.47
label: catalog number
content: 336445
label: accession number
content: 1977.1141
objectType: label: Object Name
content: Calculating Disc
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: .2 cm x 19.1 cm x 19.1 cm; 3/32 in x 7 17/32 in x 7 17/32 in