The Diseases Of Electrical Machinery

vii.i PREFACE. in being the type doomed by inherent defects to dis- appear. Nevertheless, the study of the diseases of electric machines has its importance in the industry of to-day. With the newer and larger machinery in use, new de- fects arise and old ones reappear in new forms. Only by study of the malady, when it appears, can the right treatment be discovered to prevent its reappearance. The experience of others is always useful to the novice. The knowledge of that which has happened in disease is the safest guide towards a cure. In short, by the proper study of dynamo-pathology we may arrive at a fuller command of dynamo-therapeutics. The author of this book, Mr. Ernst Schulz, a German engineer of wide experience, is known to a few in England by his writings. His little treatise on the diseases of electric machines appears to fill a use- ful place. It has now been translated for English readers, for whose benefit the present writer has added a few notes and paragraphs, though without material alteration to the text. It is but fair to state that the actual work of translation has been borne by Mr. Hugh LEDWARD, whose double training at Finsbury and Carlsruhe has qualified him to deal with technical terms. To him I return, in my capacity as editor, a grateful acknowledgment. SILVANUS P. THOMPSON.