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No Caption: c. 1910. Side view of a heavy coastal defense 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.
Date: 1910
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Caption: "Mirror Lake," c. 1917. Mirror Lake in Yosemite National Park, on Tenaya Creek, is the remains of a glacial lake that used to fill most of the valley. Its calm waters provide near-perfect reflections of the surrounding natural splendor.
Date: 1917