Ahh pedants. I find quantum mechanics makes more sense than English.
Quote:
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"alternate, alternative - Alternate can be a verb or an adjective conveying the idea of two things being done by turns, as in 'the club's pool sessions take place on alternate Tuesdays' or 'to build the wall he used layers of brick alternated with flint and mortar'.
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...so surely a pony or octo is an 'Alternate' air source as you would go to it in turn after the main failed. But a backup reg on a twinset would be an 'Alternative' air source as you have the choice of two.
:-)