As a public health precaution due to COVID-19, all Smithsonian museums and the National Zoo are temporarily closed. We are not announcing a reopening date at this time and will provide updates on our website and social media.



<< >>
Usage conditions apply
Instruments of this sort, which projected the image of objects placed on them, came into use in the second half of the nineteenth century. The “J. Duboscq / à Paris / No. 54” inscription on this example refers to Jules Duboscq, an important scientific instrument maker in Paris.
This form came to be known, in the twentieth century, as a viewgraph or an overhead projector.
Ref: J. Duboscq, “Appareil pour la projection des corps placés horizontalement,” Journal de Physique Theorique et Appliquee 5 (1876): 216-218.
Debbie Griggs, “Projection Apparatus for Science in Late Nineteenth Century America,” Rittenhouse 7 (1992): 9-15.
Currently not on view
Object Name
date made
after 1876
Duboscq, Jules
Place Made
France: Île-de-France, Paris
Physical Description
brass (overall material)
overall: 28 in x 13 5/8 in x 13 5/8 in; 71.12 cm x 34.544 cm x 34.544 cm
overall: 27 3/4 in x 13 in x 13 in; 70.485 cm x 33.02 cm x 33.02 cm
ID Number
catalog number
accession number
Credit Line
U.S. Military Academy
See more items in
Medicine and Science: Physical Sciences
Science & Mathematics
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 on our collection pages is temporarily unavailable. Please check back soon!

If you have a question or require a personal response, please visit our FAQ or contact page.