Bruning 2420 Slide Rule
date: label: date made
content: ca 1945
name: label: maker
content: Charles Bruning Company
notes: label: Description
content: This one-sided, ten-inch slide rule is made from white molded plastic. The indicator has a metal frame. The base of the rule has an A scale at the top and D and K scales at the bottom. The slide has B, CI and C scales on one side and S, L, and T scales on the other. The edges of the rule are beveled with a twenty-five centimeter scale along the bottom edge, divided to millimeters. The top edge has a twelve-inch scale, divided to 1/16".
label: Description
content: The back of the rule has tables of equivalents to be used from converting between metric and common measures, as well as a few common formulae. Four metal screws hold the instrument together.
label: Description
content: The rule fits in a sturdy paper case covered with what appears to be black plastic. A leather flap at one end snaps to close the case
label: Description
content: A paper "Instruction Manual for 10-Inch Pocket Slide Rule A-B-CI-C-D-K-S-L. and T Scales" comes with the instrument. It is copyrighted 1943.
label: Description
content: According to the donor, the instrument was given to him by an uncle, Frank Vignola, who worked at a New York City industrial machine shop during World War II. The shop made landing gear struts for carrier based aircraft.
label: Description
content: Compare 1998.0032.09.
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: Science & Mathematics
label: See more items in
content: Trigonometry
creditLine: label: Credit Line
content: Gift of Daniel Mauro
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2015.0168.01
label: accession number
content: 2015.0168
label: catalog number
content: 2015.0168.01
objectType: label: Object Name
content: calculating rule
label: Object Name
content: slide rule
label: Object Name
content: Calculating Rule
physicalDescription: label: Physical Description
content: plastic (slide, base material)
label: Physical Description
content: paper (case, instructions material)
label: Physical Description
content: metal (screws, indicator frame material)
label: Measurements
content: rule in case: 2 cm x 29.4 cm x 5 cm; 25/32 in x 11 9/16 in x 1 31/32 in
label: Measurements
content: instructions unfolded: .3 cm x 14.5 cm x 22.5 cm; 1/8 in x 5 23/32 in x 8 27/32 in