There are addition images of this expedition in Smithsonian Institution Archives, Record Unit 95, Box 56, Folder 5. See Negative Number a3590 for a more detailed description of the image below.
Smithsonian Institution Annual Report for the year 1900, Washington, D.C.: U.S. Government Printing Office, 1901.
Summary:
Smithsonian Astrophysical Observatory staff, including Secretary Samuel P. Langley, and acting director (and later fifth Smithsonian Secretary), Charles Greeley Abbot, travel to Wadesboro, North Carolina, to observe an eclipse of the sun.