Set Square Signed Desnos
date: label: date made
content: ca 1753-1782
name: label: maker
content: Desnos, Louis-Charles
notes: label: Description
content: This 4-1/2" brass rule unfolds to form a set square. The outer edge of one leg has a scale for German inches (roughly 31/32 English inches), numbered by ones from 4 to 1. The first unit is divided into twelfths and numbered by threes from 3 to 12. The scale is marked: Pouces du Rhin [inches of the Rhine]. The inner edge of this leg has a scale numbered by tens from 10 to 50. The 5 point is also marked. The scale is marked: Eschelle [scale].
label: Description
content: The outer edge of the other leg has a scale for French inches (roughly 1-1/16 English inches), numbered by ones from 1 to 4. The first unit is divided into twelfths and numbered by threes from 3 to 12. The scale is marked: pouces de Roy [inches of the French king]. The inner edge of this leg has a scale numbered by tens from 10 to 60. The 5 point is also indicated. This leg has a pinhole for hanging a plumb line and a rectangular hole with a rounded end (approximately 25/32" long) for viewing the plumb bob. This leg is also marked: Desnos AParis. Compare to 1985.0580.02, 1985.0580.03, MA.316929, and MA.316914.
label: Description
content: Louis-Charles Desnos was a cartographer and globemaker in France from about 1753 to 1782. Another plumb rule by Desnos is shown at http://teodolite.it/desnos.htm.
label: Description
content: Reference: Adler Planetarium, <i>Webster Signature Database</i>, http://historydb.adlerplanetarium.org/signatures/.
label: Location
content: Currently not on view
place: label: place made
content: France: Île-de-France, Paris
topic: label: Subject
content: Mathematics
label: Subject
content: Drawing Instruments
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Squares and Triangles
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content: Science & Mathematics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.317362
label: accession number
content: 230278
label: catalog number
content: 317362
objectType: label: Object Name
content: set square
physicalDescription: label: Physical Description
content: brass (overall material)
label: Measurements
content: overall: 11.3 cm x 1.7 cm x .5 cm; 4 7/16 in x 21/32 in x 3/16 in