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

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…

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.

Telegraph office, room 15, Elysee Palace Hotel, Paris, France, Major R.P. Wheat in charge. September 4, 1918.

Derelict tanks lie strewn about a chaotic battlefield at Clapham Junction, Ypres, Belgium, ca. 1918.

American troops aboard French-built Renault FT-17 tanks head for the frontline in the Forest of Argonne, France, on September 26, 1918.

British Mark I tank, apparently painted in camouflage, flanked by infantry soldiers, mules and horses.

A Farman airplane with rockets attached to its struts.

A German Pfalz Dr. I single-seat triplane fighter aircraft, ca. 1918.

French Cavalry observe an Army plane fly past