From: William Linne (photoassistant@hotmail.com)
Date: 04/22/02-07:28:11 PM Z
----- Original Message -----
From: "William Linne" <rebus66@hotmail.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, April 22, 2002 6:24 PM
Subject: Re: To preserve a daguerreotype. Questions
> Sorry to be so dense, but why is the final polishing better when done by
> hand? It just seems silly to me to say that a human hand is better at this
> sort of mechanical task than a machine. I am not trying to be
inflammatory,
> I really would just like to know. What is the science behind it?
>
> thanks,
>
> William
> ----- Original Message -----
> From: "Robert W. Schramm" <schrammrus@hotmail.com>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Monday, April 22, 2002 4:34 PM
> Subject: Re: To preserve a daguerreotype. Questions
>
>
> Richard,
>
> Yes, I am aware of that but also I know of a local amateur astronomer who
> made a mirror grinding machine which he used down to the last carborundum
> grit and then finished by hand.
>
> Bob Schramm
>
>
> >From: "Richard M. Koolish" <koolish@bbn.com>
> >Reply-To: alt-photo-process-l@sask.usask.ca
> >To: alt-photo-process-l@sask.usask.ca
> >Subject: Re: To preserve a daguerreotype. Questions
> >Date: Mon, 22 Apr 2002 09:37:34 -0400 (EDT)
> >
> > > I do my initial polish with a wheel. Even though it is a special
> >jeweler's
> > > wheel with special bearings and other things to reduce vibration to
> >almost
> > > nothing, I still must do the final buffing by hand with two buffs. I
> >cannot
> > > explain in words how to polish a dag plate. One must be shown by an
> > > experienced daguerreotypist. A poorly polished plate not only gives a
> >poor
> > > image but is not as sensitive as a properly polished one. I have read
> > > somewhere that the early daguerreotypists had machine powered leather
> >buffs.
> > > Perhaps something could be devised but I do not know how well they
would
> > > work. During my training I was taught how and where to place my hands
> >during
> > > buffing and how to get an even polish. Also how to know when the plate
> >is
> > > correctly polished. It struck me as being similar to mirror grinding
for
> > > astronomical telescope mirror when the final stage is also done by
hand.
> > >
> > > Bob Schramm
> >
> >
> > Optics (telescope mirrors, lenses, etc) are traditionally polished
> >with a
> > pitch lap and rouge. Amateurs often make small mirrors completely
by
> >hand,
> > including the rough grinding.
>
>
>
>
> Check out my web page at:
>
> http://www.SchrammStudio.com
>
> also look at:
>
> http://www.wlsc.wvnet.edu/www/pubrel/photo.html
>
>
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