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Turkish troops use a heliograph at Huj, near Aza City, in 1917. A heliograph is a wireless solar telegraph that signals by flashes of sunlight usually using Morse code, reflected by a mirror.

American troops using a newly-developed acoustic locator, mounted on a wheeled platform. The large horns amplified distant sounds, monitored through headphones worn by a crew member, who could direct the platform to move and pinpoint distant enemy…

The complex inner machinery of a U.S. submarine, amidships, looking aft.

German submarines in a harbor, the caption, in German, says "Our U-Boats in a harbor." Front Row (left to right): U-22, U-20 (the sub that sank the Lusitania), U-19, and U-21. Back Row (left to right): U-14, U-10, and U-12.

The Russian flagship Tsarevitch passing HMS Victory, ca. 1915.

Photographs taken of all four student groups presenting their topics.

"Frederick Douglass appealing to President Lincoln and his cabinet to enlist Negroes," mural by William Edouard Scott, at the Recorder of Deeds building, built in 1943. 515 D St., NW, Washington, D.C.

Frederick Douglass, head-and-shoulders portrait, facing right

Harriet Tubman, full-length portrait, standing with hands on back of a chair

Harriet Tubman, full-length portrait, seated in chair, facing front, probably at her home in Auburn, New York