October 2, 1922. Washington, D.C. "Ford Target Computor. Capt. H.E. Ely." An electro-mechanical approach to the aiming of large artillery pieces. National Photo Company Collection glass negative. View full size.

Washington, D.C., or vicinity, 1918. "Nat'l Emergency War Garden Commission. Girl Scouts and others." Harris & Ewing Collection glass negative. View full size.

July 16, 1925. Washington, D.C. "U.S. Patent Office." Information storage and retrieval in the analog age. National Photo Co. glass negative. View full size.

1923. Washington, D.C. "Unidentified women." There are two glass negatives of these lovely ladies; the caption labels are blank. National Photo. View full size.

May 4, 1925. Washington, D.C. "Sadie Leigh Lewis." A quick spin through the newspaper archive turns up these tidbits: Sadie died in 1944 and was a direct descendant of George Washington's sister Betty and her husband, Col. Fielding Lewis. Who can help us fill in the blanks of Sadie's life? View full size.

August 1940. Du Bois, Pennsylvania. "Farmer and wife at the Tri-County Farmers Co-op Market." Medium-format safety negative by Jack Delano. View full size.

November 1910. Birmingham, Alabama. "Donnie Cole. 'Our baby doffer,' they called him. This is one of the machines he has been working at for some months at the Avondale Mills. Said, after hesitation, 'I'm 12,' and another small boy added, 'He can't work unless he's twelve.' Child labor regulations conspicuously posted in the mill." Photograph and caption by Lewis Wickes Hine. View full size.