CONTENTS. 
CHAPTER 1. 
FUNDAMENTAIL PRINCIPLES. 
Classes of distribution—Fundamental formulze of distri- 
bution—Plate I, showing size of conductors for various 
losses—I,osses with distributed and moving loads—Simple 
and branched lines—Irregular distribution of loads—Center 
of gravity of load—ILocation of centers of distribution—Net- 
works and their computation—Variations of load, their 
nature and magnitude. 
CHAPRPIER 1L 
THE RETURN CIRCUIT. » 
Nature of the return circuit—Conductivity of rails— 
Systems of bonding—Arrangement of bonds—Resistance of 
bonds and bond contacts—Farth resistance—Leakage of 
current from the rails to earth and other conductors —Elec- 
trolysis, its distribution and amount—Remedies—Supple- 
mentary wires—Continuous track—Welded and cast joints 
—_The double trolley—Energy lost by bad bonding—Net re- 
sistance of bonded track—Track constants—Formula for 
  
complete circuit. . 
CHAPTER IIIL 
DIRECT FEEDING SYSTEMS. 
Systems of arranging feeders—Maximum and average 
drop—Load factor of the station—Wandering load—Compu- 
tation of a feeder system—Extent of lines—Average load on 
lines—Center of distribution—Maximum loads—Trolley 
wire and track return—General feeding system—Reinforce- 
ment at special points—Plate II, chart for feeder computa- 
tion—Cost of wasted energy . 
28-55 
56-83