[modeleng] Re: Mouland Valve Gear

Hi John (and Peter)

One thing that's always puzzled me about Hackworth gear is - how is the 
"lead" provided for?  I say this because there is only one eccentric and no 
secondary drive from the crosshead.

With Stephenson's gear the lead is provided by rotating the eccentric 
through an angle of advance, but you then need two eccentrics, one for each 
direction of travel.  So how can Hackworth gear get away with only one?

Regards
Ron

----- Original Message ----- 
From: "John Pagett" <john.pagett@xxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, February 23, 2005 10:14 PM
Subject: [modeleng] Re: Mouland Valve Gear


> If it's like ordinary Hackworth valvegear, then it should be a constant
> lead arrangement. 



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