This volume---originally published in the Soviet Union---is intended as a text-book for the students of technical colleges as well as engineers and designers specialising in turbine building. Basic theoretical concepts of the thermodynamic processes of stationary steam turbines have been dealt with in detail. Variable load operation of these turbines has also been considered. The reader will find here enough material concerning the basic concepts of gas dynamics as applied to steam turbines as well as design and construct ion of steam turbines and their details with regard to mechanical strength. Considerable space has been devoted to the description of turbines of various manufacture. The book contains a profusion of tables, diagrams and illustrations which, it is hoped, would enable the reader to acquire a better understanding of the theory and design of steam turbines.