French-Style Sector Signed by Louis Lennel
date: label: date made
content: 1774-1784
name: label: maker
content: Lennel, Louis-Pierre Florimond
notes: label: Description
content: The arms of this brass instrument have straight edges, but the hinge is decorated with a flower. One side has double scales of chords, running from 10 to 180; of solids, running from 1 to 64; and for the specific weights of five metals, marked with their symbols. On one arm, the outer edge has a scale that runs from 4 to 24 and is labeled "Poids des Boulets." The sector is marked: Lennel à La (/) Sphére à Paris.
label: Description
content: The other side has double scales for equal parts, running from 10 to 200; for architectural drawings, running from 1 to 64; and for the lengths of the sides of inscribed regular polygons, from 12 sides to three sides. On one arm, the outer edge has a scale running from 4 to 24 and labeled "Calibre des Pieces."
label: Description
content: In 1774, Louis-Pierre-Florimond Lennel took over the Paris workshop operated by his teacher, Jacques Canivet, who previously had succeeded his uncle, the famous instrument maker Claude Langlois. All three men supplied telescopes to French astronomers. By 1781, Lennel called himself the official maker for France's king and the navy. He died by 1784 and was succeeded by his widow.
label: Description
content: References: Maya Hambly, <i>Drawing Instruments, 1580–1980</i> (London: Sotheby's Publications, 1988), 28; Harriet Wynter and Anthony Turner, <i>Scientific Instruments</i> (New York: Charles Scribner's Sons, 1975), 158; 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: Sectors
label: Subject
content: Rule, Calculating
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Sectors
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content: Science & Mathematics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.317363
label: catalog number
content: 317363
label: accession number
content: 230278
objectType: label: Object Name
content: sector
physicalDescription: label: Physical Description
content: brass (overall material)
label: Measurements
content: overall: 3.1 cm x 16.7 cm x .4 cm; 1 7/32 in x 6 9/16 in x 5/32 in