Dear Mike,
> I seem to have talked myself into making a dial in The Gambia, about 13°
>north of the Equator. [snip] At present my thoughts are to make it from
>concrete, preferably off site, so that it can be laid in position, and
>dare I say it?, enable me to make small adjustments later if necessary.
Sorry for the delay in responding. My tuppence worth is to suggest
that you consider another variety of cement: terrazzo. Certainly in south
Asia it is widely used, inside (bathrooms, floors) and out in all weathers.
It takes a very fine finish. And in south Asia, local builders are
completely familiar with using it, grinding and polishing it, etc. Perhaps
the same is true in west Africa.
You could embed your lines of declination, etc. with brass strips
in your mould. They'd get ground down along with the cement in the
polishing and would be completly integral with the finished whole.
best wishes,
Peter
----------------------------------------------------------------------
Peter Mayer | [EMAIL PROTECTED]
Politics Department |
University of Adelaide | 'phone:+61.8 8303 5606/5610
Adelaide, SA 5005 | FAX: (+61.8) 8303 3446
AUSTRALIA |
----------------------------------------------------------------------
