Thomas Horne Preparing Diplodocus Specimen

ID: SIA Acc. 12-492 [SIA2012-2793]


Form/Genre: Lantern slides

Date: 1924

Citation: Smithsonian Institution Archives, Acc. 12-492, Image No. SIA2012-2793

Usage Conditions Apply
The Smithsonian Institution Archives welcomes personal and educational use of its collections unless otherwise noted. For commercial uses, please contact
Download IIIF ManifestRequest permissionsDownload image Print


United States National Museum preparator Thomas Horne working on the Diplodocus specimen collected in 1923 from Dinosaur National Monument Quarry. He is working to free some of the specimen's vertebrae from the surrounding sandstone. Under the direction of curator Charles Gilmore, preparators Norman Boss, Thomas Horne, and John Barrett worked for more than seven years to prepare and mount the dinosaur for display. The project was finally completed in 1931.


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


  • See also SIA2011-1427.
  • See also Record Unit 424, Box 7, Folder (mini box) 18.
  • See Gilmore, 1933, "On a newly mounted skeleton of Diplodocus in the United States National Museum," Proceedings of the United States National Museum, vol 81, article 18, pages 1-21.

Cite as

Smithsonian Institution Archives, Acc. 12-492, Image No. SIA2012-2793

Repository Loc.

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


  • 1924
  • Between 1924 and 1926

Restrictions & Rights

  • No access restrictions Many of SIA's holdings are located off-site, and advance notice is recommended to consult a collection. Please email the SIA Reference Team at
  • No Known Copyright Restrictions




Lantern slides

Local number

SIA Acc. 12-492 [SIA2012-2793]

Physical description

4 x 3.25;

Full Record

View Full Record