[modeleng] Re: Unusual Valve Gear

For members of this list that don't access the Proboards Forum I will put a
copy of John Baguley's reply. Tel was on the right track from the start.
Lee

Think I may have cracked it!

Searching back through my Model Engineers I've found an article by R M
Tyrrel ( Volume 143 Issue 3553) that describes some unusual valve gears.
There is a photo of a small 0-4-0 loco with Brown valve gear that looks
exactly the same as Neptunes. Charles Brown was an Englishman who was the
works manager at the Swiss Locomotive and Machinery Factory at Winterthur
( S.L.M. Winterthur). In 1878 he came up with the idea of splitting the
connecting rods into two sections connected by the large rocking lever. This
was because the majority of the Swiss locos had very short wheelbases to
enable them to negotiate very tight curves and it was difficult to fit a
conventional outside valve gear.

In another article on Hackworth valve gear by J N Liversage (Volume 76 Issue
1885) mention is made of the Brown valve gear which eliminated the problem
(with Hackworth's) of angularity of the radius rod affecting the valve
displacement. I can only assume from this that Brown's gear is an improved
form of Hackworth's.

John

Just found this as well which has another couple of photos of locos fitted
with Brown's valve gear:

http://irsociety.co.uk/Archives/27/CL_2.htm



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