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Posted by Gene E. Bloch on 10/05/71 11:37
On 1/12/2006, Richard Crowley managed to type:
> "doc" wrote ...
>> hmmmmm, "evaporated metal" - - metal doesn't evaporate. it oxidizes but it
>> can not evaporate. would take 5000 degrees.
>
> We've been evaporating various metals (gold, aluminum, copper,
> etc.) for several decades now in large-scale industrial settings.
> The computer you are reading this on wouldn't exist unless people
> could easily evaporate and deposit metal. Google is your friend.
>
> The filament in your CRT (and/or the incandescent light over your
> head) are both evaporating as you read this sentence. Good thing
> they're in a vacuum. Else they would oxidize really quickly! :-)
Not to mention mercury, which evaporates a bit at room temperature, and
is for this reason rather dangerous to have around, since its vapor is
very toxic.
I built my first reflector telescope around 1948 or 1949. After I
ground, polished, and figured the mirror, I sent it off to a place
which coated it with aluminum by placing it in a vacuum chamber and
evaporating enough Al to coat my mirror with a very smooth, thin, and
shiny coating.
Gino
--
Gene E. Bloch (Gino)
letters617blochg3251
(replace the numbers by "at" and "dotcom")
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