---------- Forwarded message ----------
From:
Robert Bargalló <[email protected]>
Date: 2009/9/17
Subject: Direct reading time.
To: Robert Bargalló <
[email protected]>
Hello All,
When an
inexperienced person examine a well constructed Sundial, often
underestimate the instrument because it is not marking the official
time and having to make some “antipathetic” corrections of the
indicated time. That is the main reason we have built a sundial that
gives civil time accurately, enough to adjust the minute a non solar
clock that it has stopped. In a word, in our quadrant needless resort
to the equation of time or to the local position versus the Meridian
corresponding to the time zone. No arithmetic corrections are needed.
Descriptively,
the device is a horizontal sundial with a gnomon consisting in thin
thread nylon. The mechanism presents a 48 teeth gear, powered by an
endless screw, which allows the entire clock to rotate some degrees
around an axis parallel to the Earth rotation axis (around the gnomon).
In other words, the mobile set plays like a hypothetical sundial
indicating the exact civil time is elsewhere, in another position but
in the same geographic parallel. As to the accuracy, the quadrant
presents marks of all the minutes from the 5 h 45 a.m. until the 8 h 15
p.m. The single need featuring the device is that one or twice a week
requires adjusts a rotatable knob to indicate the current date. This
disc, of course, acts on the endless screw and, for that reason, on the
rotation.
Really, the
rotation movement compensates not only the equation of the time, but
also the error caused for the geographic longitude position of the
instrument.
For the same
method we can use the sundial giving 3 types of time: the local solar
time, the standard time, or the daylight savings.
Since we
installed it, from November 2006 to date, it has indicated time with an
error that in no case exceeded one minute.
Happy Dialling!
Robert
Bargalló
