pneumatic caisson

pneumatic caisson

[nu̇′mad·ik ′kā‚sän]

(civil engineering)

A caisson having a chamber filled with compressed air at a pressure equal to the pressure of the water outside.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

caisson

1. A watertight structure or chamber, within which work is carried on in building foundations or structures below water level.

2. A sunken panel, esp. in a vaulted ceiling or the inside of a cupola; a coffer.

McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.