From: Bob Kiss (bobkiss@caribsurf.com)
Date: 03/19/02-08:26:42 PM Z
DEAR JEFF,
Originally it was exactly what it says...the glass cover over the hands
of a watch (sometimes called a watch "crystal")...what you look through to
see the time. All watches still have them but many are now high impact
plastic. Then it became a generic term for chemists (and biologists) and
they were created independent of watches specifically for measuring
chemistry.
CHEERS!
BOB
----- Original Message -----
From: <jeffbuck@swcp.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, March 19, 2002 5:49 PM
Subject: Re: Measuring
> Bob: I don't get it. What's a "watch glass"? -jb
>
> Bob Kiss <bobkiss@caribsurf.com> said:
>
> > DEAR LIST,
> > When working with expensive stuff, especially if it is "clingy" or
> > hydrophilic I use the classic "watch glass" which can be purchased from
> > chemistry supply houses or even bought from your local watch repair shop
in
> > a pinch. They come from very small diameters (and thin glass) to the
size
> > of small soup bowls. Get the glass type as some chemicals don't like
> > plastic...or like it too much! Do the standard tare procedure and, if
some
> > does cling, you won't mind dipping it right into the solution to wash
away
> > the remainder. Give it a good rinse, dry it and measure the next. Ah,
> > glass!
> > CHEERS!
> > BOB
> >
> >
>
>
>
> --
>
>
>
>
>
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