Quote:
Originally Posted by Renato1
The one thing that I never did fathom was the thing called an Autocollimator that used to be sold as a set with the Cheshire by one company. The guy who owned it couldn't make head nor tails of the instructions, he lent it to me, and I couldn't make any sense of it either.
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This may help
http://www.astrosystems.biz/coltlsm1.htm
Scroll down and download instructions for LightPipe/SightTube & Autocollimator. Page 6 describes theory behind autocollimator.
Also refer to table at top of above web page. The autocollimator is a highly sensitive device for precise collimation and used after collimation with a less sensitive device.