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A clack dish is a dish or basin with a movable lid. During the Elizabethan times beggars proclaimed their want by clacking the lid of a wooden dish.
 Research Clack Dish
Two clack valves, set back to back constitute a butterfly valve. The disk valve of rubber, plastic, vulcanised fibre, or metal moves axially on a fixed central spindle, its travel being limited by a perforated guard. If a flexible material be used for the disk the seating is usually a grid. Valves of this kind are the best for air- and water-pumps of large capacity working against moderate pressures.
Research Butterfly Valve
A clack valve or flap valve is a type of valve employed for pumps. It consists of a metal disk, or a weighted disk of leather or rubber, hinged at one side, making contact with a flat metal seat.
Research Clack Valve
Clack-box is slang for the mouth.
Research Clack-Box
Clack is British slang for chatter or talk incessantly.
Research Clack
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
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