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From: Peter Fogg (no email)
Date: Thu Jun 09 2005 - 03:00:20 EDT
> >>On Behalf Of Lu Abel
>
> Do you speak from experience or just theory about "plastic?"
>
When I've had the chance to examine them I've found them disconcerting to
use - for example, the index error was different each time I checked on one
instrument, before and after taking a sight. It didn't inspire confidance. I
know and accept that they have been used to cross oceans with, and possibly
they are ideal for the task of teaching students.
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