Chamber(redirected from Valved Holding Chamber)
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(or breast), in mining, a relatively short mine working with a large cross section. The dimensions and the characteristics of location, construction, and operation of chambers are determined by their purpose.
The term “chamber” includes workings used for the place-ment of equipment and special shaft or mine services (an under-ground electric power substation, pumphouse, catch basin, electric locomotive depot, control room, medical station, orwaiting room), excavations for the mining of minerals by theunderground method, and special-purpose underground structures (underground engine rooms of hydroelectric power plants; subway concourses).
(1) The name of representative bodies or constituent parts thereof. For example, in the USSR the Supreme Soviet of the USSR consists of two equal chambers, the Soviet of the Union and the Soviet of Nationalities.
(2) The name of certain state or public organizations and establishments—for example, the Chamber of Commerce and Industry and the Book Chamber.