Johann August Natterer

In 1847, he obtained his medical doctorate from the University of Vienna, later practicing medicine in Wien-Leopoldstadt.

[1] In 1854, he attempted to liquify "permanent gases" using pressures up to 3600 bars (about 3550 atm), but failed.

Consequently, no matter how high the pressure he could achieve, there would be no phase transition from gas to liquid.

In 1841, using a Voigtländer camera on daguerreotype plates that were prepared according to a chemical process developed by Franz Kratochwila, they were able to increase the sensitivity five-fold, and reportedly achieved exposure times as low as 5 to 6 seconds in clear weather.

[4] In the mid-1840s, using a compressed air chamber pump invented by J. Schembor (1777–1851), he was the first scientist to produce liquid carbon dioxide in significant quantities.