Yard workers, aided by a crane, hoist a 16"/50 Mk VII gun barrel aboard the <a href="//commons.wikimedia.org/wiki/USS_Iowa_(BB-61)" class="mw-redirect" title="USS Iowa (BB-61)">USS <i>Iowa</i></a> during her construction in 1942.
U.S. Navy photo
<a rel="nofollow" class="external text" href="http://www.navsource.org/archives/01/61d.htm">Source</a>