[Bell Historians] Adjustable Louvres

[Robert Lewis]

Going through RW correspondence from 100 years ago, I was wondering 
if there are any examples of towers that do (or did), in fact, have 
adjustable louvre boards "operated like venetian blinds".

I imagine that any such installation would be highly prone to 
mechanical failure and would be quite difficult to install, operate 
and maintain, not to mention the exterior aesthetic considerations - 
but it is an interesting idea.

Can anyone enlighten me please?

RAL



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