Gate chamber

a recess in the side wall of a canal lock, which receives the opened gate.

See also: Gate

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
As the air supply vent in the roof of the gate chamber is limited in size, there is a need to assess if it should be enlarged to reduce its throttling effect on the air flow.