Re: [ATM] re Slide rule

["Jule DuBois" <jjdubois@insightbb.com>]

I have some B&W pictures that are 150 years old that are still as good as 
when taken.  What will be the archival properties of digital images?  Clay 
tablets and silver halide have their advantages.

Jule DuBois

----- Original Message ----- 
From: "Ellen Mackenzie" <mackenzieconsulting@sympatico.ca>
To: "atm" <atm@atmlist.net>
Sent: Sunday, September 12, 2004 2:52 AM
Subject: [ATM] re Slide rule


> My slide rule will give me the same answer as someone else's, I can't say
> the same for software, recently Richard Snashall and I were exchanging
> programs to see if my software OSLO, OPTALIX, gave the same results as his
> ZEMAX. OPTALIX gave a reasonably similar result as ZEMAX, But OSLO was 
> out-
> - - or was it the other way around? Who knows - - - only my log tables and
> 20 inch slide rule with AutoCAD will say.
> Having worked with false colour and IR films I would have to say
> that CCD would give more consistent and probably accurate results. Film is
> still best for X-rays as far as I know and my Germanium detector with
> photomultiplier tube and scintillometer are all I have for Gamma - - - of
> course you can always just look and see things with marvel ?
> Ellen
>
>
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