330-PS-1897 (USN 708245):   Navy Develops “Sound Proofest” Rooms.  These men have “extra ears” for the listening of sounds from this piece of machinery in one of the testing rooms at the new Naval Acoustical Laboratory at Annapolis, Maryland.  On the wall is fiber glass covering of the “accordion” form, the newest design yet achieved in sound-proofing.  The achievement in sound detection was made possible by the combination of this entirely new idea in sound-proofing and a unique building design.  The building is constructed “inside out,” with the interior suspended from outside structural supports.   The principal achievement was the creation of an “accordion” form for absorbing sounds.   One of the chief elements of the form is fiber glass in sheets eight feet wide and of various lengths.  This glass “pillow” was wrapped around a collapsible steel framework which when opened, resembles a spring of v-shaped decorations.  The interior of the rooms presents a quilt-line appearance.  This decoration has given the Navy what is perhaps the most sensitive sound-free room ever built.   The new laboratory has three testing rooms, in any one of which it is possible to record virtually the lowest and highest sound frequencies without interference.  The Navy’s civilian engineers worked out the plans for the new testing facility and supervised the construction.  It is the property of the Navy’s Bureau of Ships.  Photograph released May 25, 1951.   (6/16/2015).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/127906254@N06">National Museum of the U.S. Navy</a>
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