Hi,

SPARC-FAL-LAB., INFN, Frascati, Italy

I think everyone having an UPS-system running is able to do such a measurement. We have different systems running, both with conventional gas discharge lamps using He or Ne), as well as with a tunable laser system. Feel free to ask for more details if you are interested, Dirk

Indeed, beside the suspension railway ("Schwebebahn", see https://en.wikipedia.org/wiki/Wuppertal_Suspension_Railway), we are the hometown of Engels (http://www.friedrich-engels-haus.de/index_en.php, there is a Chinese Web-Page as well http://www.friedrich-engels-haus.de/index_cn.php), and Pina Bausch (http://www.pina-bausch.de/en/index.php), the "famous" soccer Club (back to the golden years in the 1970ies, check https://en.wikipedia.org/wiki/Wuppertaler_SV), and and and.

Despite many prejudices, a nice place to live, with extremely nice countryside, and short distances to Cologne, Düsseldorf, Dortmund, ... in the heart of Germany!

Dirk

P.S. I declare, that I am not paid for advertisements!

Hi,

Thank you to all of you. I will carefully consider your suggestions in the shortest possible time.

Mohamed