[modeleng] Re: Back on Track was HSE

At 04:06 PM 6/22/07 +0100, you wrote:
>First find your window!

Alan,
     YES I KNOW . . . and have several sets!  :-)  And these will be split
bezels so that the glass is replaceable.  The brass (actually a bronze)
rings are already on hand.

>Had you thought about cutting the from sheet

      Not initially as I thought this would be an easy (& cheap) find . . .
So now I am considering cutting them myself, either from glass or
polycarbonate, although I really would prefer the glass.
      I have a relative in the industrial glass business so I will consult
with him first, but my inclination would be to glue the glass to screw a
piece of wood to the faceplate, face off, cement the glass to the surface
and scribe it with a diamond cutter in the tool post.  Something tells me
this sounds much easier than it actually will be.

>Bet that wouldn't pass "Inspector Meticulous" even if it is prototypical!

     But that's the way I'm leaning.

        Something else of interest which relates . . . . . you may recall being
told that a bit of spit on the file nick in a gauge glass will cause it to
snap quick and clean?  While wasting yet more time on the www the other day
I found a possible explanation of why this is so.  Make of it what you will.
        According to Scientific American (Magazine), glass cracks more easily
under water.  When a water molecule enters a crack, a reaction occurs in
which a silicon-oxygen molecule bond in the glass and an oxygen-hydrogen
bond in the water are cleaved, creating two hydroxyl groups attached to a
silicon.  As a result, the length of the crack grows by the size of one
molecular bond rupture per molecule of water.  The water reaction reduces
the energy necessary to break the silicon-oxygen bonds, thus the crack
grows faster and cleaner.

Regards,
Harry

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