Karl Baedeker died, the "Pall Mall Gazette" described a Baedeker guidebook as being "singularly accurate", and in the English version of Jacques Offenbach's musical "La Vie parisienne" this memorable lyric rings out: "Kings and governments may err / But never Mr. Baedeker." Towards the end of his life, Baedeker told friends that he regretted not having accomplished more in his life and wondered whether his work would survive. Little did he know that the name Baedeker would one day become a synonym for a travel guide, whatever its provenance, and that Verlag Karl Baedeker, which still exists and continues to bear his
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