Calculating Disc, Helicopter Performance Computer, Felsenthal FNA-408
date: label: date made
content: 1964
name: label: maker
content: Felsenthal Instrument Co.
notes: label: Description
content: This plastic instrument consists of a round white base, a tan disc with clear space around part of the rim, and a clear plastic rotating indicator. The parts are held together by a metal rivet at the center. A mark on the base reads: HELICOPTER PERFORMANCE COMPUTER. Two graphs on the disc read: TAKE OFF (/) POWER (/) AVAILABLE. One is for a difference of temperatures of ten degrees, the other for a difference of temperatures of two degrees. The third graph is for hovering at different outside air temperatures.
label: Description
content: A mark on the back reads: UH-IE-NATC (/) FELSENTHAL INSTRUMENTS CO. (/) PART NO. FNA-408 (/) U.S. PROPERTY.
label: Description
content: The museum has two examples of the object.
label: Location
content: Currently not on view
place: label: place made
content: United States: Illinois, Chicago
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: 1977.1141.45
label: catalog number
content: 336429
label: accession number
content: 1977.1141
objectType: label: Object Name
content: Calculating Disc
physicalDescription: label: Physical Description
content: plastic (overall material)
label: Measurements
content: overall: .2 cm x 13.5 cm x 12.7 cm; 3/32 in x 5 5/16 in x 5 in