Cogar Thermotechn. 2512 Linear Slide Rule
notes: label: Description
content: This one-sided linear slide rule has a wooden core coated with plastic, a plastic cursor, and a paper label stuck to the back. The scales are 25 cm. long (extended somewhat to both the left and the right). They are not lettered. The beveled top edge of the rule has a scale of equal parts 27 centimeters long divided to .1 cm. for the first 20 centimeters and to .05 centimeters from 20 to 27. Below this, still along the beveled edge, is a scale of inches, divided to .02 inches.
label: Description
content: The first logarithmic scale runs from 1 to 100 in 25 cm. and from .7 to 120 over its full length. The lower part of the base has a scale running from 1 to 10 over 25 centimeters and from .9 to 11 overall. It is used for finding squares and square roots. Below this is a scale for finding square roots of the difference between 1 and the square of x. It runs down from .995 to 0.The slide has a scales that runs from .7 to 120, a scale that runs from 12 down to .9, and a scale that runs from .9 to 11. The reverse side of the runner has scales that run from 1.01 to 1.2, from 1.1 to 3.2, and from 2.5 to 10. The back of the rule suggests how it is used and lists various constants.
label: Description
content: The rule fits in a black cardboard box.
label: Description
content: According to the donor, this rule was made by prisoners in a Hungarian prison.
label: Location
content: Currently not on view
place: label: place made
content: Hungary
topic: label: Subject
content: Mathematics
label: Subject
content: Rule, Calculating
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 Laszlo Kutor
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2014.0136.03
label: catalog number
content: 2014.0136.03
label: accession number
content: 2014.0136
objectType: label: Object Name
content: slide rule
physicalDescription: label: Physical Description
content: wood (base, slide material)
label: Physical Description
content: plastic (coating, runner material)
label: Physical Description
content: paper (stickers, box material)
label: Measurements
content: overall: 2.2 cm x 30.7 cm x 4.6 cm; 7/8 in x 12 3/32 in x 1 13/16 in