 In 1827 Fechner took a long journey through Bavaria, Salzburg, Tirol, and Switzerland, which finally ended with his three month stay in Paris. There he finally met Biot and Thénard as well as André Marie Ampère (1775–1836); their exacting experimental work served as a model for him. Fechner’s translations of Biot and Thénard played an important role in disseminating French mathematical science in Germany. 