Area of wire in units of 1000 circular mfilis. 
  
0. 0000 
  
o 
DIRECT FEEDING SYSTEMS. 81 
2100 
1950 
1650 
1500 
1050 
900 
Pounds per 1000 feet of Bare Copper Wire. 
PYATE 1L 
AREA AND WEIGHT OF COPPER 
required for transmitting 100 amperes for dis- 
tances of 25000 feet and less, at 50 volts loss, with 
various constants for track return. 
  
  
  
10 15 20 2 
Distance in units of 1000 feet. Street Railway Journal,