The equation of time is not ignored by the Long Now clock. In one of
their FAQs they state:
The clock is projected to be accurate to within one day every 20,000
years, but just in case it isn't, a solar synchronizer will correct
the time shown on the clockface. A lens on top of the clock
Hi dialist fellows!
I'm considering to make a sundial with marble. Does anyone have some tips in
how to engrave this type os material? I've already manually engraved slate with
nails of different diameters, but when I try the same process with marble I do
not get neat lines.
What I'm looking
Dear colleagues,
You may be interested to know that the 3-D cam for the EoT mechanism (looking
like a piece of modern sculpture) was on show at the 2008 BSS Conference at
Latimer. A photograph of it is in the report of the conference in the BSS
Bulletin, 20(ii), June 2008.
Regards,
Very fine lines can be etched with an abrasive blaster. Silicon carbide
is the best blasting material, but aluminum oxide (less expensive) also
works well. I hire a sign maker to blast the granite (and occasionally
marble) stones for my Sawyer Equant sundials. The lines are about .040
wide
Dear friends,
We are pleased to announce CONGRESO INTERNACIONAL DE SOL which will be
held at Museo de las Ciencias de Castilla-La Mancha in Cuenca, managed by
our friend Keiko Mataki, on 24th, 25th and 26th of October 2008. The event
includes lectures, exhibition, tours and visits to
Bill,
Thanks for the tips. Both are very interesting approaches. I will try both, the
abrasive blaster and the dremel-like one. But I think I need to buy a good
quality marble instead of the cheapest ones.
Thanks,
Ricardo
São Paulo - Brazil
-- Início da mensagem original ---
I am grateful and relieved to know that my concerns were misplaced!
Or maybe not as I adore catastrophic errors. They teach us so much! Indeed
they teach us almost everything.
I won't, well ~ maybe I will, mention the Hubble telescope and a failed Mars
lander.
Closer to home ~ the Millennium
