From: Dale Eason 
To: atm{at}shore.net
Reply-To: Dale Eason 


There as been some misunderstanding on the list about what is or is not a
truss.  Several telescope designs with parallel poles have been called
trusses.  They are not.  I'm not a structural engineer so I'm not sure what
they are called.  I think there are cantilever beams.

Anyway the definition of the truss can be found here:
http://www.freeessays.cc/db/5/avk32.shtml

The defining element is that trusses have a triangular element.  And that
some members are in compression or tension.  The parallel implementations
create more shear than tension or compression I think.

Dale Eason

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