Albree Trulog Duplex Circular Logarithm Table
date: label: date made
content: after 1945
name: label: maker
content: Albree, G. Norman
notes: label: Description
content: This is Norman Albree's pilot model for a two-sided circular logarithmic chart. The side labeled A has a double logarithmic scale arranged in a spiral of seven turns. Its outer edge is marked from 1 to 3.15. The inner edge is marked from .0 to .5. The side labeled B also has a spiral double logarithmic scale, marked from .315 to 1 on the outer edge and from .5 to 1 on the inner edge. A clear plastic cursor folds over the edge of the instrument and is pivoted at the center on both sides.
label: Description
content: The A side is marked inside the fourth spiral: 19©45, and at the center: TRULOG DUPLEX. The B side is marked inside the fourth spiral: 19©45 (/) G. N. Albree, and at the center: G. NORMAN ALBREE. The instrument was received with a hand-sewn brown leather pouch. George Norman Albree, the inventor and donor, was an aeronautical engineer. See also MA.335484 and MA.335486.
label: Location
content: Currently not on view
place: label: place made
content: United States: Massachusetts, Boston
topic: label: Subject
content: Rule, Calculating
label: Subject
content: Chart, Logarithmic
label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
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content: Slide Rules
creditLine: label: Credit Line
content: Gift of G. Norman Albree
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.335487
label: catalog number
content: 335487
label: accession number
content: 321674
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: paper (part material)
label: Physical Description
content: plastic (cursor material)
label: Physical Description
content: wood (overall material)
label: Physical Description
content: metal (part material)
label: Measurements
content: overall: 1.5 cm x 26.2 cm x 24.5 cm; 19/32 in x 10 5/16 in x 9 21/32 in