Borek Communication Code Plotter, Felsenthal FDB-1
date: label: date made
content: 1943
name: label: maker
content: Felsenthal Instrument Co.
notes: label: Description
content: This white plastic device is part of the Felsenthal Collection of mathematical instruments. One side has twenty-six rows giving permutations of the alphabet. These are labeled on the left with the letters from A to Z. The other side has a thirteen by thirteen grid of rectangles. Many of these rectangles have a two-digit number or two letters in the upper left corner. Toward the center of many rectangles is a term such as “AIRCRAFT” or “ATTACK” or “ROUNDS” that might be used in military communication. The terms are, for the most part, arranged alphabetically going across the top row, then across the second row, and so forth. Not all the rectangles with terms have a two-character corner mark. A slide marked with rectangles, each having a diagonal line, moves across the top of the grid of rectangles. Another slide, also marked with rectangles cut by diagonal lines, moves along the left side.
label: Description
content: A label received with the object indicates that is a Borek Communication Code Plotter, made by Felsenthal for the U.S. Army in 1943.
label: Description
content: Reference:
label: Description
content: Accession File.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
label: Subject
content: Codes and Ciphers
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Military
label: See more items in
content: Science & Mathematics
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: 1977.1141.07
label: catalog number
content: 336391
label: accession number
content: 1977.1141
objectType: label: Object Name
content: plotter
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Measurements
content: overall: .4 cm x 21 cm x 16 cm; 5/32 in x 8 9/32 in x 6 5/16 in