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 30, 1929. "Dr. K.C. Dickinson, chief of the Heat and Power Division of the Bureau of Standards, and the control room of the new aircraft engine testing laboratory at Arlington, Virginia. Here all engines for use on licensed airplanes are to be tested. The control room and the room in which the engines are mounted are heavily reinforced with concrete to prevent flying engine parts striking the observers." Harris & Ewing Collection glass negative. View full size.