Re:T-arms & uniballs

[JHertzman@domain.elided]

The ongoing trunnion-bar saga, started by Steve Smith and marching on with 
contributions by Alan Lambert, Mike Grace, Dana Loomis, Gregg Hermann and now 
Dana again, currently ends with Dana citing the center radius rod with a 
uniball at each end as described in the CRH. Dana does not mention, 
presumably because he knows that everyone knows it, that this works with and 
only with other means of lateral location- the sliding block in the factory's 
version, a Panhard rod in probably most other versions, or one of Arthur 
Mallock's or Michael Mumford's ingenious systems.

An all-uniball system would be easy enough, reverting to the upper triangle 
introduced on the 1900 and used on the Giuliettas and 102-106 cars, as well 
as on the 159 along with its DeDion rear axle, but that leaves us with the 
high rear roll center which was the reason for introducing the sliding block 
and the upper link Dana describes.

John H.
Raleigh, N.C.

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