During this period Berlin was the nearest academic city and the place where many Poles studied. Jan Czochralski went there at the end of 1904 and began to work in the pharmacy and drugstore of Dr. A. Her-brand in Altglienicke (today one of the districts of Berlin). He carried out analyses of ores, oils, greases and metals and he acquired knowledge and independence in formulating research topics. Later he worked for a short period in the laboratory of Kunheim and Co. in Niederschoenweide near Berlin and then in Allgemeine Elektrizitaets-Gesellschaft (AEG). His in Kabelwerk Oberspree and the two years spent in their research laboratories prepared him to become head of the laboratory of steel and iron research. This laboratory dealt with checking the quality and purity of metals and alloys and was engaged in the refinement of copper. Simultaneously he attended lectures on chemistry at the Charlottenburg Polytechnic near Berlin. In about 1910 he obtained the title of chemist-engineer. From 1911 to 1914 he was an assistant of Wichard von Moellendorff with whom he published his first paper devoted to the crystallography of metals or more precisely to the dislocation theory (Technologische Schlüsse ans der Kristallographie der Metalle [Technological conclusions from metal crystallography], Zeitschrift des Vereines Deut-scher Ingenieure 57, 931-935,1014-1020 (1913)).
The main work of Czochralski was the introduction of aluminum to electrical engineering i.e. the pioneering works on the technology of the production of sheets, wires and pressings of aluminum, the study of aluminum alloys and standardization of metallographic studies. Metals and metallography were Czochralski’s passion. His achievements were outstanding and made new roads in metallurgical science and technology. Czochralsk’s fame grew slowly and steadily.