276 iNDi-:\ 



PAGE 



Iron, saturation curves 20-24 



silicon steel 49 



space factor in laminations 41 



used in permanent magnets 50 



virgin state of 32 



VK. inductance 186 



wire cores 41 



Joints in transformers 81 



Joulecen, definition of 264 



Kelvin's law 253 



Knee of saturation curve 25 



Laminations, grades of 44 



preparation of 50 



reason for 41 



Lateral compression in the magnetic field 244 



Law of induction 6, 57 



Law, Ohm's, for magnetic circuit 7 



Laws of circulation 7, 57 



Leakage coil, definition of 215 



factor, calculation of 108 



definition of 107 



vs. leakage flux and permeance 109 



Leakage flux 16 



about armature windings 218 



belt, description of 223 



in field poles, as affected by load 113 



as affected by saturation 112 



effect of 108 



in induction motors, description of 221 



in transformers 208 



nature of, in machinery 86 



zig-zag, description of 223 



Leakage inductance. See Inductance. 



See also Leakage permeance. 



Leakage permeance between field poles 108 



in induction machines, values of 225 



in synchronous machines, values of 230 



of coils in a D.C. machine 236 



of slots, calculation of 226 



of windings, formula for 220 



of zig-zag or tooth tip leakage, calculation of 227 



Lehmann, Dr. Th., method of finding permeance of irregular field 18 



Lifting magnet 243 



