corkscrew stair

spiral stair, caracole, circular stair, cockle stair, corkscrew stair, spiral staircase

spiral stair
A flight of stairs, circular in plan, whose treads wind around a central newel. Also called a helical stair, solid newel stair.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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with floors at uneven levels and wearying corkscrew stairs ...
A Library with a future: T.G. Otte goes to the heart of Whitehall to explore the origins and future of an important government archive which is becoming far more accessible to historians

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