11-05-2007, 09:08 PM
Quote:One machine I've seen uses both concurrently.Belt and braces! I tend to think of the circular ratchet as a Roman innovation, so it would go along with a Vitruvian spring-frame (i.e. single central stanchion, rather than a pair of middle stanchions).
But, let's face it, you're the boss on this one!
Further to the linear ratchet, you might find this diagram from Marsden useful (in case you don't have his Technical Treatises book). It shows three possible designs, of which the middle one (labelled b) was found to be the most efficient. (The one labelled c is Schramm's rather complicated design.)
[size=75:1cmny3xt]Wow! I didn't think I'd scanned it so big![/size]