Kohlrausch Bridge

Friedrich Wilhelm Georg Kohlrausch (1840-1910) was a professor of physics at Göttingen, Zürich, Würtzburg, Strasbourg and Berlin during his career. He wrote a widely-used book on methods of experimental physics, and developed improved measurement techniques in electricity and magnetism.

This instrument can be found in the 1921 catalogue of E. Leybold's Nachfolger [Successors] of Cologne at a price of $38. The text reads: "Kohlrausch's universal bridge, allowing of reading the resistance of wires and electrolytes in ohms, with induction coil and 5 coils of 0.1, 1, 10, 100, 1000 ohms for comparison, available for resistances from 0.05 to 20000 ohms."