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A plug door is a door designed to seal itself by taking advantage of pressure difference on its two sides and is typically used on aircraft with cabin pressurization. The higher pressure on one side forces the usually wedge -shaped door into its socket to create a seal, which prevents it from being opened until the pressure is equalised on both ...
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To seal the gate the enlarged 'keel' of the ship caisson fits closely into a groove in the stonework of the lock opening. Flexible material is attached to this prominent keel and seals the water. Originally rope or oakum packing was used. Modern caissons use neoprene rubber. To make use of the pressure of water acting on the caisson, the seal ...
It represents (from top to bottom): the moon; the sun; the elements; and fire. Ouroboros: Ancient Egypt and Persia, Norse mythology: A serpent or dragon consuming its own tail, it is a symbol of infinity, unity, and the cycle of death and rebirth. Pentacle: Mesopotamia
I’m not proud to admit this, but once, I tried to walk through a close sliding glass door. What can I say, I was going fast, it was incredibly clean, and it looked like it was open. I ended up ...