Share this credible answer with others. Simply paste this code into your blog or Web page:
A more common example is the air lock between the outer atmosphere and the working chamber of a caisson . By its means access can be gained to the working chamber without loss of pressure. It is also used at the head of tunnel excavations underwater.
|
Answer verified with
|
HighBeam gives you access to newspaper, magazine, and trade journal articles plus press releases, facts, information, and biographies from thousands of sources.