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Caption: "U. S. 10" New Model Gun Carriage.," c. 1908-1912. Side view of a coastal defense disappearing gun carriage, without the gun barrel installed. Retracting or disappearing guns were a form of artillery developed in the nineteenth century in which heavy artillery guns were placed on rotating carriages that allowed retraction of the weapon after firing, to enable reloading while under enemy fire.
Date: 1908
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Caption: "San Francisco in 1849. Center of Town." This photograph shows the central portion of an 1886 lithograph by Henry Firks, depicting San Francisco as it appeared in 1849.
Date: 1849