After visiting Yverdon Les Bains and the village of Cronay this May 2005, I now have the Family Act of my G Grandparents Jean Pierre Potterat and Jenny Bruand. They had nine children Francois, Lucie, Rosine Lucy, Marie, Elisa Louise, Alois, Jean Ulysse, Alfred and Margueritte. All were born in Cronay. The family act also shows the parents of Jean Pierre and Jenny which is also very helpful.
I also printed off all Potterat births and Deaths in the Canton of Vaud through the mid 1800s so if anyone needs assistance don't hesitate to contact me.