This book is the fourth and final in the publication "People of Russian Science." It includes 76 essays on the largest figures in domestic technology and technical sciences. The reader here will get acquainted with the wonderful master of foundry Andrei Chokhov, heat engineer Ivan Polzunov, the builder of the hydraulic structures that struck at one time Kozma Frolov, the creators of the first Russian steam locomotives Efim and Miron Cherepanov and other talented immigrants from the common people who rose to the heights of technical creativity. About the life and works of famous electrical engineers V.N. Chikolev, P.N. Yablochkova, M.O. Dolivo-Dobrovolsky and others will learn the reader of this book.