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:
Circa 1907. "Aerial bridge. Duluth, Minnesota." Suspended Car Transfer over the Duluth Ship Canal. The gondola could carry 60 tons of cargo across the 300-foot channel with minimal obstruction of the shipping lane. After modification for service as a vertical lift, the span became known as the Aerial Lift Bridge. 8x10 dry plate glass negative, Detroit Publishing Company. View full size.