Albree Trulog Duplex Circular Logarithm Table
date: label: date made
content: after 1948
name: label: maker
content: Albree, G. Norman
notes: label: Description
content: Aeronautical engineer George Norman Albree (1888–1986) designed airplane components and slide rules. This is an example of his Duplex slide rule, which he intended to be used by grade school children. It is printed on both sides of a cardboard circle and consists of a logarithmic spiral scale for numbers from 10,000 to 32,100 on the front or "A" side and numbers from 31,170 to 100,000 on the back or "B" side. A rotating clear plastic indicator wraps around both sides.
label: Description
content: On both sides, the center of the spiral is marked: ALBREE TRULOG DUPLEX (/) MODEL 18. Inside the fifth ring of the spiral on the front, the instrument is marked: ©1945 (/) G. NORMAN ALBREE (/) BOSTON MASS. The instrument arrived with a plain square paper case, an instruction manual, and a green paper bag. The cover of the manual reads: MANUAL (/) of the (/) TRULOG DUPLEX (/) Precision Pocket Calculator (/) Multiply - Divide - Raise to Any Power - Extract Any Root. The booklet was copyrighted in 1948. The bag is marked: THE (/) TRULOG DUPLEX (/) With Right Hand Instruction System.
label: Description
content: Albree renewed the copyrights for the Albree Trulog Duplex (R560370) and Albree Trulog Spiral (R560371) in 1973. See also MA.335486 and MA.335487.
label: Description
content: References: Timothy Hughes, "The George Norman Albree Papers," <i>New England Ancestors</i> 5, no. 3 (2004): 46, http://www.americanancestors.org/PageDetail.aspx?recordId=134553447; Library of Congress, <i>Catalog of Copyright Entries, Part 4</i>, n.s. 40 (1945 index): 287; <i>Catalog of Copyright Entries: Books: Part 1A</i>, 3rd ser. 2, no. 1 (1948): 313; Library of Congress Copyright Office, <i>Renewal Registrations: Works of Art</i> (July-December 1973): 476; Henry W. Syer and Donovan A. Johnson, "Aids to Teaching," <i>Mathematics Teacher</i> 43, no. 5 (1950): 215–221, on 220; accession file.
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: Education
label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Science & Mathematics
label: See more items in
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.335484
label: catalog number
content: 335484
label: accession number
content: 321674
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: paper (overall material)
label: Physical Description
content: plastic (cursor material)
label: Measurements
content: overall: .1 cm x 15.4 cm x 15.2 cm; 1/32 in x 6 1/16 in x 5 31/32 in