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The last pictures reminded me of my initial efforts on a Dobsonian.
I generated Alt/Azm scales to 6 arcminute precision in Autocad and printed them out on a 15 inch dot matrix printer, scaled to suit the base and Alt surfaces. They were carefully centered and pasted. They worked great I was even able to find stars during the day down to second magnitude. I could read altidtude to about 6 arcminutes and azimuth to 3 arcminutes.
barry
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