Complete Installation of the Diplodocus Longus in National Museum

ID: SIA Acc. 12-492 [SIA2012-2792]


Form/Genre: Lantern slides

Date: 1931

Citation: Smithsonian Institution Archives, Acc. 12-492, Image No. SIA2012-2792

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Dinosaur Diplodocus longus as originally installed in the "Hall of Extinct Monsters" of the United States National Museum (now the National Museum of Natural History). The bones comprising the dinosaur were collected mostly in the Dinosaur National Monument in Utah in 1923, and over the next seven years were prepared and mounted primarily by Norman Boss and Thomas Horne, under the scientific direction of Charles Gilmore. This image was taken shortly after the dinosaur was installed in the exhibit hall in 1931.


  • United States National Museum
  • United States National Museum Department of Paleontology
  • Century of Progress International Exposition (1933-1934 : Chicago, Ill.)


  • See also MNH-32017A and SIA2017-038185.
  • See also Record Unit 7005, Box 189, Folder 9 and Record Unit 424, Box 7, Folder (mini box) 20.
  • See Charles Gilmore's publication, "On a newly mounted skeleton of Diplodocus in the United States National Museum,"Proceedings of the United States National Museum No 2941, pages 1-21, 1933.

Cite as

Smithsonian Institution Archives, Acc. 12-492, Image No. SIA2012-2792

Repository Loc.

Smithsonian Institution Archives Capital Gallery, Suite 3000, MRC 507; 600 Maryland Avenue, SW; Washington, DC 20024-2520



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  • Dinosaurs
  • Exhibitions


Lantern slides

Local number

SIA Acc. 12-492 [SIA2012-2792]

Physical description

4 x 3.25;

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