Karl Baedeker (scientist) Karl Baedeker (scientist) Karl Wilhelm Sali Baedeker (3 February 1877 – 6 August 1914) was a German physicist, and a professor at the University of Jena. He was the grandson of Karl Baedeker, the founder of the eponymous travel guide publishing house, and the son of Fritz Baedeker (1844 - 1925), who ran the same company from 1869 until his death in 1925 (see Baedeker). One of his scientific discoveries was that the resistivity of cuprous iodide (CuI) depended on its stoichiometry. Thin films of the material became much more conductive when exposed to iodine vapor; the effect was reversible.
Baedeker victim of the post-war international geopolitical and economic conditions. Consequently, in 1920, Fritz broke with tradition and for some time thereafter, Baedeker guides to German cities and regions carried a limited amount of advertising. Fritz Baedeker's released 39 guidebooks in German from 1872 to 1925, and 21 in English from 1872 to 1914. Twelve French titles were published between 1882 and 1910. 1925−1943: Hans Baedeker (1874−1959), the eldest son of Fritz Baedeker, took charge of the company in difficult times. His two brothers, Ernst and Dietrich, were with him, running the company. The firm had lost heavily by investing in