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No Caption: c. 1908-1912. Group of men posing around a 12-inch disappearing gun. 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. Such guns were often used in coastal fortifications.
Date: 1908
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Caption: "Crossing the Line California to Nevada," c. 1915, shows railroad tracks intersecting the border between California and Nevada in the Sierra Nevada.
Date: 1915