Drawing Instrument, Coordinate Window
notes: label: Description
content: This small flat piece of translucent plastic has indicated on it a 10x10 grid of squares. The lines forming the grid are numbered from 0 to 10 along the base and along the left side of the grid. Units on the grid represent 100 yards, on a scale of 3 inches = 1 mile (e.g. one side of the grid represents 1000 yards).
label: Description
content: The instrument was used – and possibly made - by Alfred J. Betcher (1887-1971), who studied engineering at West Point and went on to rise to the rank of colonel in the U.S. Army.
label: Description
content: Reference: Accession file.
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: Science & Mathematics
creditLine: label: Credit Line
content: Gift of John A. Betcher
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1982.0386.04
label: catalog number
content: 1982.0386.04
label: accession number
content: 1982.0386
objectType: label: Object Name
content: Drawing Instrument
physicalDescription: label: Measurements
content: overall: 10.4 cm x 11.5 cm; 4 3/32 in x 4 17/32 in