Umov N.A. Course in Physics. Lectures. Volume 2. Sound. Light. Electricity. Magnetism. In Russian (ask us if in doubt)/Umov N.A. Kurs fiziki. Lektsii. Tom 2. Zvuk. Svet. Elektrichestvo. Magnitizm. M. Typography by O.L. Soiova. 1902. 441 and IVc. Life Edition. Nikolai Alekseevich Umov (1846-1915) - Russian theoretical physicist, philosopher, Emeritus Professor at Moscow University. SKUalbb7af192f052dbe6e.