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:
June 1924. Washington, D.C. "Carl W. Mitman, Curator of Engineering, U.S. National Museum [Smithsonian Institution], holding what is believed to be the first radio tube, made in 1898 by D. McFarlan Moore of New York. Radio waves emanating from this tube ignited a bomb a city block away and blew up a miniature of the Battleship Maine." Harris & Ewing glass plate. View full size.