* Calibrate the Declination circle
. With an ETX sitting on a flat, horizontal surface, level the tube by using a bubble level as a gauge.
The telescope's newly designed fork has a declination circle
on only the right arm.
We view the declination circle
through a 6x telescope (a salvaged finderscope) mounted on the polar axis near the eyepiece.
No blueprint for the missing declination circle
could be found, so the AAAP had to work from the picture reproduced on page 32 - the only known photograph of the telescope at its original site.
"Even if I feel a little sleepy at the beginning of the night," he continues while eyeing the declination circle
, "just walking into the dome, looking up at the telescope, and knowing that I'm going to be working with it gets the adrenaline pumping.
(It can happen.) After setting the slip ring of the clock drive to the star's right ascension, I read the declination circle
and record any significant deviation.
You'll also need to calibrate the telescope's declination circle
on a star of known position.
The declination circle
, however, is not preset at the factory.
Missing were the original built-in magnifying glasses for reading the telescope's right ascension and declination circles
. In July 2009 the Skyscrapers board called upon Hall's services again, asking now for a total restoration.
The declination circles
(two, on the east and west sides) are marked in 1 [degrees] increments.
"Now, slew the telescope until the pointers on the right-ascension and declination circles
read the coordinates of any star or planet that is currently visible in the sky.