LIST OF ILLUSTRATIONS xiii 



no. 



90. To illustrate Principle of Phase Transformation ..... 118 



91. Scott's Method of Phase Transformation ....... 118 



92. Squirrel-cage Rotor .......... 116 



93. Starting Resistance for Wound Rotor ....... 120 



94. Kahlcnberg's Starting Resistance ........ 121 



95. Five Horse-power Induction Motor (The Electric Construction Co.) . . 128 

 90. Type of Stator Winding .......... 126 



97. Vector Diagram of Synchronous Motor ....... 129 



98. Variation of Current with Angle of Advance of Motor e.m.f. . . . 181 



99. Relation connecting Driving Power with Angle of Advance of Motor o.m.f. 181 



100. Connection between Excitation and Overload Capacity .... 182 



101. Relation connecting Excitation and Armature Current .... 138 



102. Damping Grids fitted to Alternator Poles ...... 187 



103. Leblanc's " Amortisseur " . . . ..... 188 



104. Connections of Synchronizer ......... 140 



105. Details of Rotary Synchronizer ........ 148 



106. Connections of Rotary Synchronizer ....... 144 



107. Dial-plate and Pointer of Rotary Synchronizer ..... 144 



108. Mechanism of Visual Signal ......... 145 



109. Three-phase Synchronizer ......... 147 



110. To explain Principle of Three-phase Synchronizer ..... 148 



111. Showing Arrangement of Lamps of Three-phase Synchronizer . . . 148 



112. Vector Diagram of Parallel -connected Alternator ..... 149 

 118. Vector Diagram of Loaded Alternator or Transformer .... 158 



114. Kapp's Construction for Variation of Drop with Power Factor of Load . 154 



115. To illustrate Algebraical Method of determining Drop .... 155 



116. Rothert's Ampere-turn Method of determining Drop .... 157 



117. Analysis of Armature Reaction into Two Components .... 159 



118. Blondel's Determination of Two Components of Armature Reactance . 160 



119. Fischer-Hitmen's Method of determining the Two Components of Armature 



Reactance ............ 161 



120. Berry's Method of determining the Equivalent Impedance of a Trans- 



former ............ 166 



121. Measurement of Core Losses of Two Similar Transformers . . . 167 



122. Sumpner's Transformer Efficiency Test ....... 168 



128. Measurement of Copper Losses of Two Similar Transformers . . . 168 



124. Showing Temperature Rise in Transformer ...... 171 



125. Relation connecting Iron with Excitation Loss ..... 179 



126. Transformer Equivalent of Induction Motor ...... 186 



127. Vector Diagram of Equivalent Transformer ...... 187 



128. Transformed Vector Diagram ......... 189 



129. Construction for Slip and Torque of Induction Motor .... 191 



130. Heyland's Circle Diagram ......... 194 



131. Construction of Circle Diagram from Experimental Data . . . 201 



132. Curves derived from Circle Diagram ....... 203 



188. Soames' Testing Brake .......... 204 



184. Walker's Air-friction Dynamometer ....... 206 



135. Grau's Eddy-current Brake ......... 207 



186. Morris and Lister's Eddy-current Brake ...... 208 



137. Drysdale Direct-reading Slip Indicator ....... 210 



