Скачать или смотреть The shaping and testing of two 20-inch optical telescope mirrors

Presented by Johann Swanepoel at the ASSA Symposium, 2012 October 13, at SAAO in Cape Town.
"The purpose of the presentation will be to share my experiences and knowledge gained in the making of two 20-inch f/4.3 telescope mirrors. It will cover details of a versatile machine that was built for the grinding, polishing and figuring of the mirrors. It will further include details of the various full and sub-diameter tools that were made and used. An explanation will be presented on the optical testing methods used throughout the figuring process, including an improved application of the Foucault test and the corresponding digital data reduction techniques."
Visit the official symposium website for further details:
http://symposium2012.assa.saao.ac.za