xxii CONTENTS
PAG B
250. Unipolar machine adapted for low voltage, or for large size high
speed machines—Theoretical absence of core loss—Possibility
of large core loss by eddies, in core and in collector rings, by
pulsating armature reaction...............456
251. Circular magnetization produced by armature reaction—-
Liability to magnetic saturation and poor voltage regulation—
Compensating winding—Most serious problem the high speed
collector rings.....................457
252. Description of unipolar motor meter...........458
CHAPTER XXIII. REVIEW.
253. Alphabetical list of machines: name, definition, principal
characteristics, advantages and disadvantages.......459
CHAPTER XXIV. CONCLUSION.
254. Little used and unused types of apparatus—Their knowledge
important due to the possibility of becoming of great industrial
importance—Illustration by commutating pole machine . . 472
255. Change of industrial condition may make new machine types
important—Example of induction generator for collecting
numerous small water powers..............473
256. Relative importance of standard types and of special types of
machines.......................474
257. Classification of machine types into induction, synchronous,
commutating and unipolar machines—Machine belonging to
two and even three types................474
INDEX............................477