Karl Baedeker name, would, in its heyday which lay ahead, become the premier and most successful travel guide publishing house in the world. Karl Baedeker died in Koblenz on October 4, 1859. He was only 57. In The New Yorker profile of the "House of Baedeker" Herbert Warren Wind wrote: "For years, he had attempted to do the work of several men, preparing the new guidebooks single-handedly and periodically revising the older ones. At length, his sturdy physical endowment had worn out under the strain." Michael Wild wrote in his article mentioned earlier: "It is a moot point whether he invented tourism
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