CONTENTS. 
MiscELLaNeous Ratios: Form Factor—Coil Breadth and 
Pole-Arc Ratio—Pole-Are and Pole-Pitch Ratio..... 97-111 
PROBLEMS IN DesiGN: Regulation and Efficiency —Num- 
ber of Ampere-Turns—The Influence of Length of 
Mean Turn—Minimum Material Cost—Magnetic Flux 
and’ Comimercial Regulation) wate se Ree 113-116 
RELIABLE DATA FOR ALTERNATOR DeEsIGN: Choice of Ar- 
mature Flux—Peripheral Densities for Polyphase Ma- 
chines—Peripheral Speed—Effective Iron Length— 
Alternator Proportions—Output Constant Pole-Arc 
Ratio—Slot Details—Pole-Core Height—Cooling Sur- 
face—Air-Gap—Final Determinations.............. 116-126 
Three-Phase Revolving Field Alternator Design ........ 126-148 
Design of a Low-Speed, Revolving Field Type, Two-Phase 
Alternator, \.siwichicwugta eb tee PL ey ee 148-160 
Design of Standard Speed Revolving Field Type Three- 
”" "Phase Alternator... 55.4) gtsac puns beeen Ome 161-174 
Design of 25-Cycle Revolving Field Type Three-Phase Alter- 
NAGOL 2 SEE seni jess tegatana Sep debe. pk doce ae we 174-185 
Design of Revolving Field Type Single-Phase Alternator. . 185-195 
Design of Inductor Type Single-Phase Alternator....... 195-206 
Design Sheet, Formule Used in Design................ 206-210 
PracTicAL WorKING OF ALTERNATORS: Paralleling— 
Speed Variation—Flywheel Effects—Balancing—Heat- 
ing and Humming—Faults—Terminals and Slip Rings. 210-214 
Questions on the Design of Alternating Generators and 
Synchronous Motors. «1:4 65). Scasiao eee boes ayia 215 
DU BSRIONG 5 v.vao9 4 i<0) 00s a SRA eh ee , 1-80 
