Abstract :
Since electricity has become recognized as the most important means for transmitting energy the value of uniformity in voltage and frequency has become more and more apparent. The phenomenal growth during the last few years in the electrical industry has been due as much to the marked advances in the methods for maintaining a uniform service as to any other cause. During this period of rapid development many papers have been written, setting forth different ideas as to ways of providing against interruptions. At the beginning, these ideas varied greatly, but now there seems to be some hope for a more uniform practise as to this type of apparatus. In writing this paper I have assumed that the field has been pretty well covered so far as the prevention of interruptions goes, but have to call attention to that class of interruptions which so far have been and will likely continue to be unavoidable; and have endeavored to describe certain means whereby the effect of unavoidable interruptions may be reduced to a minimum.
