The 34 cm. Brass Sundial.
The dialplate is 32 cm. in diameter, and stands on a baseplate
34 cm. square. The height to the top of the gnomon is 13.5 cm, and
the dial complete weighs 5.3 kg. The baseplate has 4 fixing holes
to secure the sundial to the plinth or other horizontal mounting
surface; the dialplate, after it has been oriented
correctly is locked down with the central screw. This prevents
the dialplate being knocked out of alignment, and also protects the
fixing holes to prevent pilferage.
Reading your Sundial
You tell the time from the top edge of the shadow, and you read
the Arabic numerals in summer time and the Roman numerals in the
winter. The shadow first sweeps out the morning hours (see top picture,
where the time is 9.25 if summertime is in operation, or 8.25 in
winter). The dialplate is marked with long hour lines extending
from the base of gnomon, short 10-minute lines, and 5-minute dots,
so you can read the sundial to within a minute or two.
Setting up your Sundial
five minutes at noontime, a line of light shines between the two
plates of the gnomon, and you use this feature to set up the sundial
"spot-on" to true north, so that it will always tell the correct
time. After it has been set up, the dialplate is locked down with
the special key for the centre screw, and cannot then be knocked
out of alignment. (This feature also protects the 4 fixing holes
in the baseplate to prevent pilferage).
Looking after your Sundial
Your sundial will need very
little maintenance: you just need to wash it with warm soapy water
from time to time. The surface will gradually darken with exposure
to the air, and will show the shadow line even more clearly on this
matt background. .....more
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