Derek Harrison's Crossword Message Board

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Re(3): Listener No. 4415: Right and Left by Ploy

When I was at colledge 40 odd years ago doing my City and Guilds, one of the engineering lecturers there was adamant that a thread (apart from a BSP thread) is a helix, not a spiral, as a spiral slowly increases diameter during each revolution.

He was right, I think - so a spiral staircase isn't - it's a helix staircase.



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