Glossary

The voussoir or keystone of an arch, especially when carved as a cartouche.

The chief meeting place or marketplace in an ancient Greek city.

A machine which draws in air at atmospheric pressure, then compresses it to pressures higher than atmospheric and delivers it

A stream of high-velocity temperature- controlled air which is directed downward, across an opening; excludes insects, exterior drafts, etc.; prevents the transfer of

Said of animals or figures placed back to back in decorative sculpture.

A device used to hold a doorframe above the finished floor.

A try square the arm of which is at right angles to the handle; the position of the arm may be moved

A structural system for supporting an acoustical ceiling; may incorporate lighting fixtures and air diffusers.