December (?) – in the yearbook Jahrbuch für Fabrikanten und Gewerbtreibende, Physiker, Chemiker, Techniker, Pharmacenten, Oekonomen u.s.w., for 1840 (II. volume, 1839) set out by Ferdinand Hessler and published in Prague (Vereine zur Ermunterung des Gewerbsgeistes in Böhmen) was printed Hesslers article \"Daguerre\'s Verfahren bei Fixirung der Bilder in der Camera obscura\", which contains also 6 diagrams and is the second detailed description of making daguerreotypes printed in the Czech lands.