Washington, August 18, 1924. "Miss V.P. Porter, Bureau of Standards." National Photo Company Collection glass negative, Library of Congress. View full size.

Washington circa 1930. "Franklin School building exterior, 13th Street N.W." National Photo Company Collection safety film negative. View full size.

December 22, 1924. "J.E. Hoover, Bureau of Investigation, Department of Justice." A young J. Edgar Hoover, age 29, director of the government agency that we know today as the FBI. National Photo glass negative. View full size.

November 1909. The 25th annual National Horse Show at Madison Square Garden in New York, in one of those ultra-detailed yet otherworldly views so characteristic of large-format glass negatives (8x10 inches here). View full size.

April 1909. Anthony, Rhode Island. "One of the young spinners in the Quidwick Co. Mill. A Polish boy, Willie, who was taking his noon rest in a doffer-box." Photograph and caption by Lewis Wickes Hine. View full size.

1864. "Chattanooga, Tenn. Confederate prisoners at railroad depot waiting to be sent north." Wet plate glass negative, photographer unknown. View full size.

Washington, D.C. "Kendrick-Harrison Furniture Co. window." Next door to this slightly spooky circa 1922 display of Heywood-Wakefield baby carriages is a palm reader. National Photo Company Collection glass negative. View full size.