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<ul><li><b>Scope and content:</b>  Original Caption: U.S. Military Academy, West Point, N.Y. Drilling with 6" disappearing guns. Gun has been laid in direction and elevation and has been tripped to firing position. No 1 is ready to fire the piece by pull of lanyard at the command of the gu</li></ul></div>
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Unknown author<span style="display: none;">Unknown author</span> or not provided</div>
<a href="https://en.wikipedia.org/wiki/U.S._National_Archives_and_Records_Administration" class="extiw" title="en:U.S. National Archives and Records Administration">U.S. National Archives and Records Administration</a>