342-FH-3B23427:   Japanese Fu-Go Balloon.   A master aneroid (center, covered) controls the Japanese Balloon’s minimum altitude.  The others are used if the master fails.  Uncovered aneroids show how the electrical current circuit is closed when increased air pressure forces down the disk, bringing a wire loop in contact with a horizontal pin which passes through center of the loop.  U.S. Army Air Corps (Air Force) photograph, now in the collections of the National Archives.  (5/26/2015).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/127906254@N06">National Museum of the U.S. Navy</a>
2015-05-26 10:15
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