Identified! [Charles Greeley Abbot, astrophysicist and Secretary of the Smithsonian, with his device: a silver-disc pyrheliometer which measures direct beam solar irradiance] (LOC)
Photos displaying on either side of this one in the Prints & Photographs Online Catalog may yield clues—view the neighboring photos: www.loc.gov/pictures/related/?&pk=hec2008003390&s...
Harris & Ewing,, photographer.
[Charles Greeley Abbot, astrophysicist and Secretary of the Smithsonian, with his device: a silver-disc pyrheliometer which measures direct beam solar irradiance]
[between 1913 and 1917]
1 negative : glass ; 5 x 7 in. or smaller
Title information from Flickr Commons Project, 2015.
Date based on date of negatives in same range.
Gift; Harris & Ewing, Inc. 1955.
Format: Glass negatives.
Rights Info: No known restrictions on publication.
Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc.pnp/pp.print
Part Of: Harris & Ewing Collection (Library of Congress)
General information about the Harris & Ewing Collection is available at hdl.loc.gov/loc.pnp/pp.hec
Higher resolution image is available (Persistent URL): hdl.loc.gov/loc.pnp/hec.04702
Call Number: LC-H261- 4348