Watts linkage ratios?

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rlukens

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Hello forum.
In designing my second model... a beam engine. I'm considering Watts linkage versus an external piston rod guide. I like the aesthetics of the Watts linkage, it's more "blingy". While I've found many examples of this set-up, I've found no formulae for the ratio or relationships of the actual links. Can someone enlighten me?
TIA, this forum has been most invaluable and entertaining to me.
Russ
 
Crueby, I found that page. Took a few re-reads but I got it.
Stargen, that is blingy. I'm going to bone up on it too.

Thanks guys for your input.
 

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