DIRECT-CURRENT DYNAMOS AND MOTORS. dL 
cent.; magnet cores, rectangular cross-section, 12 inches 
thick, 19 inches wide, 164 inches long; yoke, hollow 
decagonal prism, internal diameter 45 inches, length 23 
inches, radial depth 11 inches. Current output, 1,400 
amperes; armature flux, 90,000,000 webers; leakage 
factor, 1.2. Allow 25 per cent. in length of air gap for 
distortion of lines. 
300. Find the ampere-turns required for a 6-pole ring-type 
2,500-ampere generator, the following data being given: 
External diameter of armature, 96 inches; internal 
diameter, 60 inches; length, 34 inches; length actually 
occupied by iron discs, 28} inches; number of slots, 264; 
size of slots, 22 X 3% Inch; winding, 2 conductors per 
slot, connected in drum fashion (by means of formed 
face connectors at end surfaces of armature core); 
magnet cores, wrought iron, 30# inches in diameter, 20 
inches long, provided with wrought iron pole shoes, 
34 X 34 X 24 inches; yoke, cast steel, 161 inches in 
diameter, 38 inches wide, 10 inches deep; bore of pole- 
pieces, 967 inches; armature flux, 170,000,000 lines; 
factor of leakage, 1.18. Assume average gap density 
to be 14 times the density at pole faces, and take length 
of air space 1} times the actual gap distance. 
Printed in U.B. A, 
