Hello,

Thank You all for Your help!

The solution is very easy. My mistake was the translation of the word
"perpendicular". In german I know the word "Perpendikel" whitch is the
pendulum of a big clock. So I had the idea of a mesurement right and left
side of the radial.

Nowing now, that the mesurement is taken rectangular to the radial, it is
very easy to understand.

:-))

Good bye,
Klaus, pleas excuse my bad English!

--
www.wagner-mem.de