File:NNSA-NSO-574.jpg

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Description PLUMBBOB - 1957 - NEVADA TEST SITE -- Hollow steel ball serves as a blast valve for the ventilating system in the French rectangular shelter to be tested late in August. This view of the ball, which can be moved easily, is from the main shelter chamber, looking through a steel air intake tube, large enough to seat a person of average size. About three feet in diameter and slightly larger than the tube, the steel ball is set in an over-size spherical chamber at the end of a pipe leading from an automatic ventilating device. The ball is designed to be forced by the blast into the tube opening in order to seal off the ventilating system during the first few moments after detonation. As the pressure of the shock wave decreases, the ball will drop back into place, permitting normal operation of the ventilating system.
Source
This image is available from the National Nuclear Security Administration Nevada Site Office Photo Library under number PLU-57-194.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required.

Author National Nuclear Security Administration / Nevada Site Office
Permission
(Reusing this file)
Public domain This image is a work of a United States Department of Energy (or predecessor organization) employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.

Please note that national laboratories operate under varying licences and some are not free. Check the site policies of any national lab before crediting it with this tag.

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current01:03, 3 September 2012Thumbnail for version as of 01:03, 3 September 20121,420 × 1,139 (396 KB)Bomazi{{Information |Description=PLUMBBOB - 1957 - NEVADA TEST SITE -- Hollow steel ball serves as a blast valve for the ventilating system in the French rectangular shelter to be tested late in August. This view of the ball, which can be moved easily, is...
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