Karl Baedeker Scandinavia and Russia - another Baedeker innovation. In 1981, Alex W. Hinrichsen (1936 - 2012), a leading authority on the history of the Baedeker family and their publishing house, and also on the German artist, graphic designer and illustrator Paul Neu (1881 - 1940), produced an easy to understand numbering system for all Baedeker travel guides and handbooks published since the 1828 "Rheinreise" which has the number D000. He updated the list in 1991. According to Hinrichsen's revised list, which starts with the D000 edition, the number of Baedekers he listed, in German, English and French, was just eight short
Karl Baedeker (scientist) This was the first example of doping a semiconductor to change its properties and also the discovery of transparent conductive materials. He also observed a Hall effect in transparent copper iodide thin films that had the reverse sign to that in copper, an observation of what was later to be known as conduction by electron holes in semiconductors. This observation was critical in developing the theory of electron conduction in solids. Along with his graduate student Karl Steinberg, Baedeker studied the effect of varying concentration of iodine on the electrical properties of copper iodide. He also is credited with making