Browse Items (149 total)

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.

Photograph showing the conditions of African Americans caught up in the convict leasing program.

A statistical breakdown of the enslave population of the United States between 1790 and 1854. This accounts for gender and age demographics, population by region and state, and the mortality rate by state. This document also shows the enslaved…

This document provides an account of scurvy seen among enslaved peoples during the Middle Passage. This document also shows the author's belief that some of the ailments could be contributed to the trauma of the slave trade and their capture.

This educational module examines the role of the North African Campaign in the fall of Germany and the end of World War II. This campaign held great strategic importance and allowed the Allies to gain ground into Germany and Italy. In addition to its…

A document that sets the standards for admitting new states into the union. It also prohibits slavery in the expanded tarritories.