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:
Wilmerding, Pennsylvania, circa 1905. "Machine shop, Westinghouse Air-Brake Co." Company namesake George Westinghouse invented the railway air brake in 1869 and was a rival of Thomas Edison in the early electrical industry. 8x10 inch dry plate glass negative, Detroit Publishing Company. View full size.