INDIA 281 



PAGE 



Semi-eyrnmet rieal sparing 203 



Series-parallel circuits with iron 29 



Series-reluctances 16 



Sheet metal. See Laminations. 



Short chord or short pitch windings. See Fractional pitch windings. 



Silicon steel 49 



Simple magnetic circuit 1 



Skin effect 188 



Slot factor, definition of 68 



formulae for 69 



leakage permeance, ralrulation of 226 



Slotted armature, how torque is produced in 258 



Solenoidal, term applied to magnetic field 6 



Space factor in iron 41 



Sparking. See Commutation. 



Speed of a variable-speed D.C. motor under load 171 



Squirel-cage winding 133 



Steimnetz's law for hysteresis 48 



Steel. See Iron. 



Stray flux or leakage 16 



Sii|eri>osition, principle of 194 



Synchronous condensers 157 



Synchronous machines, armature reaction in 140 



e.m.f . induced in 65 



fictitious poles assumed in 151 



loaded, flux distribution in 139 



measurement of leakage inductance 219, 231 



i load capacity of motor 148 



phase relation of m.in.fH. in a 143-145 



reactive drop in a (limits of) 229 



torque in 259, 260 



typi'sof 63 



values of leakage permeance of the windings of. . 230 



vector diagrams of. with non-salient |x)les. . 145, 147 



with salient |.i>l.- lf>4 



Synchronous motor, definition of phase characteristices of .142 



overload capacity of 148 



Teeth, apparent flux density in 101 



permeance of tooth f n i \ . ; 



saturated, m.m.f. for .101 



tapered, m.m.f. f. r .100 



Tension. See aUo Force, mechanical 



longitudinal, in magnetic field 242 

 Torque. See also Force, mechanical. 



from equivalent electrir -in -uit 260 



in revolving machines, how produced . 258 



