Magnetic circuits -- Properties of ferromagnetic materials -- The magnetic-circuit concept -- Principales of magnetic circuit computations -- Permanent magnets and energy in the magnetic field -- Losses in magnetic cores containing time-varying fluxes -- Alternating-current exitation characteristics of iron-core reactors and transformers -- Model theory and design of iron-core reactors -- Thermal properties and heat flow -- Transformers -- General design and cost considerations -- Transformers; general principles -- Physical features of transformers -- Magnetic leakage in transformers -- Leakage inductances -- voltage regulation, efficiency, and rating -- Autotransformers -- Economy in power-systems transformer applications -- Self-and mutual inductances -- Frequency characteristics -- Special applications of transformers in power systems -- Applications of transformers in telephone systems -- Three-phase connections; general considerations -- Effects of transformer impedances in balanced three-phase circuits -- Unbalanced conditions in three-pharse transformer banks -- Three-phase conections of autotransformers -- Three-phase transformers -- Multicircuit transformers -- Transformers connections for phase transformation -- Parallel operation of transformers