Originally posted by cartesio Actually that is a helix, like DNA. Spirals have increasing amplitude, helices have constant amplitude.
Guess many people will have to modify the names of innumerable "spiral staircases."
They coild be called be helical staircases or coiled staircases.
EXCEPT in "informal" English usage, acceptable because it's in every dictionary, "spiral" can be used to mean "helix."
I used to have this argument going back more than 50 years about "rules" vs "usage" determining what is acceptable in the English language. It was always my position that usage dictates the rules. The rules merely encode ubiquitous usage. The classic case is the use of "like" where by the rules the correct word is "as," and the classic example was "Winston tastes good, like a cigarette should" whereas the correct form, by the rules, should be "Winston tastes good, as a cigarette should." Peruse the posts on PF you will find many examples of using "like" where "as" is the by-the-rules the correct word, the usage has become so common that the rule has become an antiquated absurdity. Its akin to never using a preposition to end a sentence, yet there are many examples where it is acceptable and rewording to avoid that rule results in clumsy wording that can interfere with communication, primarily in interrogative sentences. (Up to what do you think you are?).