Most of the photos on this site were extracted from reference images (high-resolution tiffs, 20 to 200 megabytes in size) from the Library of Congress research archive. (To query the database click here.) Many were digitized by LOC contractors using a Sinar studio back. They are adjusted by your webmaster for contrast and color in Photoshop before being downsized and turned into the jpegs you see here.
Vintage photos of:
December 1942. "Production. Mercury. Loading mercury ore into a mine car by hand at the New Idria, California, plant of the New Idria Quicksilver Mining Company. Triple-distilled mercury is produced from cinnabar, an ore containing sulfur and mercury mined at a number of workings near the plant." Photo by Andreas Feininger for the Office of War Information. View full size.