Protractor Signed by Delure

Protractor Signed by Delure

<< >>
Usage conditions apply
Downloads
Description
This brass semicircular protractor is graduated by single degrees and marked by tens, from left to right and from right to left, from 10° to 180°. The degree lines are probably stamped rather than engraved by hand and thus represent a notable increase in workmanship over MA.326978 and MA.316861. Higher levels of accuracy were not reached until machine division was achieved by instrument makers such as Jesse Ramsden, who worked approximately fifty years after this protractor was manufactured.
The inner edge of the base of the protractor is slanted, and there is a notch at the origin point. The base carries a maker's mark: Delure À Paris. The protractor is very similar to one depicted in the famous manual on mathematical instruments by Jean-Baptiste Delure's son-in-law, Nicolas Bion. The protractor dates to about 1720. It was purchased in 1959 from the estate of Henry Russell Wray via an auction conducted by Maggs Bros. Ltd. of London.
References:
Nicolas Bion, Traité de la construction et des principaux usages des instruments de mathematique (Paris, 1709), 25–27.
Peggy Aldrich Kidwell, Amy Ackerberg-Hastings, and David Lindsay Roberts, Tools of American Mathematics Teaching, 1800–2000 (Baltimore: Johns Hopkins University Press, 2008), 166–168.
Maya Hambly, Drawing Instruments: 1580–1980 (London: Sotheby's Publications, 1988), 120–121.
Jean-Dominique Augarde, "La fabrication des instruments scientifiques du XVIIIe siècle et la corporation des fondeurs," in Christine Blondel et al., eds., Studies in the History of Scientific Instruments (London, 1989), 62–63.
Reference:
Sotheby & Company, Catalogue of a Collection of Scientific Instruments, the Property of the Late Henry Russel Wray, London, 1959 (a copy of the catalogue is in the accession file).
Location
Currently not on view
Object Name
protractor
date made
ca 1720
maker
Delure, Jean-Baptiste-Nicolas
place made
France: Île-de-France, Paris
Physical Description
brass (overall material)
Measurements
overall:.1 cm x 11 cm x 7 cm; 1/32 in x 4 11/32 in x 2 3/4 in
ID Number
MA.316930
accession number
228694
catalog number
316930
subject
Protractor
Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Protractors
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.

Note: Comment submission is temporarily unavailable while we make improvements to the site. We apologize for the interruption. If you have a question relating to the museum's collections, please first check our Collections FAQ. If you require a personal response, please use our Contact page.