KOHLRAUSCH, kOFroush, FRIEDRICH (1840 —). A German physicist, horn at Rinteln, the son of Rudolf Hermann Arndt Kohlrausch. His education was obtained at Erlangen and GOttin gen. In 1866 he became professor at Gidtingen, and subsequently was appointed to chairs at Zu rich( 1870) , Darmstadt ( 1871 ) , Wfirzburg, ( 1875), and Strassburg( 18881. In 1895 he was appointed president of the imperial Physico-Technical Insti tute (RcichsanSt(Iii ) at Charlottenburg• near Ber lin• and under hi: direction the work of this bu reau has been widely extended and developed. Professor Kohlrausch has a brilliant record as an experimental physicist and has devised new apparatus and methods for measurements. His researches have embrated all departments, hut those dealing with electricity and magnetism are of special importance. Be has investigated most thoroupitly the suhjeet of electrolysis and has brought out new methods for the absolute meas urement of resistance. The elasticity of solids
and various problems in light have also been in vestigated by him, and he is the author of Leit faden der prakiischen Physik, which, puldished in 1872, has been issued in many editions and trans kited into English. being considered the standard work on physical laboratory method, and meas urements. A ninth edition, enlarged and revised. was published in 1901 with the title of Leh•bilth der praktischen Physik. A more elementary work based on the above, /i/einer Leitfaden der pork tischen Physik, has also appeared. Professor K(dilrausch is beside, the author of Leber den absoluten Lcitungswidersdand des (lueeksilbe•s 118SS), and of ninny papers contributed to the d'-r phy,ik nod Chonie, and other scien tific journals.