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My guess for the reason for the gas-filled double-paned glass is because of the pressure that is exerted on the structure and elevator by lightning strikes and from the natural pressure that the structure itself exerts.
Originally posted by 2nd Hand Thoughts
I see we all have our own theories. I don't understand the pressure thing.
www.nps.gov
2001: A new elevator cab was installed with glass panels in the doors to view the commemorative stones on the 180,170,140 and 130 foot levels within the interior of the monument. The cab holds 25 passengers, and takes 70 seconds going up and 2 minutes and 18 seconds coming down. The additional time on the descent is to allow for viewing 45 of the 193 stones.
1959: A new elevator was installed that could ascend in 70 seconds from the ground to the observation level, and descend in 60 seconds carrying 40 passengers. In the same year a dehumidifier was installed in the base of the monument to rid the problem on interior condensation.
Originally posted by Seekerof
Strange how some resort to coming up with "theories as to why" when they can not explain something factually.
Originally posted by 2nd Hand Thoughts
I saw the history or discovery channel program on the restoration of the Washington Monument and something seemed a little goofy to me.
Why all the high-tech fancy schmancy stuff with the elevator window? Apparently as you ride up, the window is made of double glass panes and is filled with a gas. It's normal state is cloudy and non-transparent. As the elevator nears carved stones, triggers are tripped and the gas is charged causing it to become transparent, allowing riders to view the carvings.
This seems like a lot of trouble. Why not a just a regular window?
What was the setup before?
This doesn't seem the best way to DISPLAY things but rather a way of COVERING things up.
Does it really matter? I don't mean to burst anyone's bubble but an elevator is an elevator. It's not like they are trying to hide some national secret.