[ATM] Speculum Mirrors

[artbianconi@blast.net]

So far I've yet to find the formulation Rosse used to match 
speculum's alpha.  

Now here's the question.  I can't be sure of the exact alloys I 
have and consequently their alphas.  So if I solder these two 
metals together and their alphas are known to say +- 1 percent 
and differ in the worst way, how bad is it going to be?  Anyone?

I am puzzled:  why don't you simply make the ribs from the same 
material as the mirror? It appears you have access to a foundry. 
Pouring a thin "puddle" on a casting plate would give you as 
thick or thin a wall as you need for cutting out ribs. 

It appears that you poured the mirror blank yourself using the 
same foundry methods. If you did then you are probably familiar 
with investment plaster and lost wax process. If so, then I would 
ask why didn't you mold the ribs at the same time you poured 
the mirror?

Art Bianconi

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