1850
Puhar, perhaps on the advice of F. Schmidt, soon made contact with the secretary of the Academy of Sciences in Vienna. The secretary Schrötter von Cristelli was a scientist who chiefly dealt with problems involving sulphur, which is why he found Puhar's process with sulphuric vapours interesting. Towards the end of the year 1850, they maintained an animated correspondence in secret. The results were positive - the members of the Academy carefully examined Puhar's invention using the attached pictures.
