160 ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 
The total weight of the machine is 63,952 pounds, exclusive 
of the shaft and bearings, which for such large direct 
coupled sets are supplied by the engine makers. 
The above figures clearly indicate that the idle material 
of the low speed machines with their large diameter, is 
considerably increased compared with that of a standard 
speed alternator. 
298. Summary of Design.—In conclusion it should be men- 
tioned, that good regulation and efficiencies could have 
been obtained more advantageously by applying greater 
flux and less ampere turns, which would imply a smaller 
diameter and a larger iron length. It was not possible 
to comply with this condition, as the specified flywheel 
effect necessitated a larger diameter. The only improve- 
ment which could be made in this particular design, is a 
slight increase in the flux, so reducing the armature am- 
pere turns, as well as the field turns. With regard to the 
specific utilization of the materials, it should be pointed 
out that the density of the flux in the armature core ought 
to be lower, so making the saturation higher, because the 
field winding could stand a higher current density than 
actually used, see Par. 290.. 
Printed in 0. &. a. 
