FRONTISPIECE General View of Panama-Pacific International Exposition by Artificial Illumination. See lecture by W. D'A. Ryan, page 547. ILLUMINATING ENGINEERING PRACTICE LECTURES ON ILLUMINATING ENGINEERING DELIVERED AT THE UNIVERSITY OF PENNSYLVANIA PHILADELPHIA, SEPTEMBER 20 TO 28, 1916 UNDER THE JOINT AUSPICES OF ILLUMINATING ENGINEERING SOCIETY MCGRAW-HILL BOOK COMPANY, INC. 239 WEST 39TH STREET. NEW YORK LONDON: HILL PUBLISHING CO., LTD. PUBLIC LIBRARY 788332 ASTOR, LENΟΣ AND 1917 COPYRIGHT, 1917, BY THE ILLUMINATING ENGINEERING SOCIETY THE MAPLE PRESS YORK PA PREFACE The history of organized effort in establishing the scientific basis of illumination and in developing the art of illuminating engineering in the United States is largely the history of the Illuminating Engineering Society. Individually the various natural sciences upon which the science of illumination is founded had each progressed after its own kind and had included in its progress the investigation of many questions of essential value in lighting, but the directive influence which has conduced to intensified consideration of the special aspects of the respective science peculiarly applicable in lighting was wanting until the Illuminating Engineering Society inspired organized effort. In the fall of 1910 the now memorable course of lectures on illuminating engineering, given at the Johns Hopkins University under the joint auspices of the University and of the Illuminating Engineering Society, had as its principal object "to indicate the proper coördination of those arts and sciences which constitute illuminating engineering." In this course of lectures the correlation of the fundamental sciences was attempted, and the endeavor was made to establish a science of illumination and to indicate the progress of the art. The emphasis, however, was placed on the establishment of the scientific foundation since this was considered of primary importance, and prior to the delivery of the Baltimore lectures it might be said with fairness that there existed generally an ill-defined and limited conception of the basic idea of illuminating engineering science. The Baltimore lectures accomplished their object, and with a better-defined science the art has progressed rapidly. It seemed, therefore, to the Council of the Illuminating Engineering Society that the time was ripe to supplement the course of lectures given at the Johns Hopkins University with a second course devoted to the more practical aspect of illuminating engineering the principles of illumination and the conspicuous advances in the art of illumination. Consequently, upon invitation from the Provost of the University of Pennsylvania the present course of lectures was organized by Committees under the administration of the Council of the Illuminating Engineering Society. The twenty-two lectures, printed in this volume, were delivered at the University of Pennsylvania between the dates September 20 and September 28 inclusive, by men peculiarly qualified by training and experience to present the most advanced treatment of illumination problems. It is worthy of record here that there were 180 subscriptions to the entire course and that in addition 59 tickets to individual lectures were sold. Supplementing the lectures an exhibit was arranged which exemplified modern methods of illumination and illustrated modern lighting appliances. An inspection tour was also organized in connection with the lectures, including visits to places of interest to lighting men, in Pittsburgh, Washington, Philadelphia, Atlantic City, New York, Boston, Schenectady, Buffalo, Cleveland and Chicago. EDWARD P. HYDE. THE INCEPTION OF THE 1916 ILLUMINATING ENGINEERING COURSE In considering special activities when undertaking the Presidency of the Illuminating Engineering Society in the summer of 1915, I conceived the idea of a course of lectures on illuminating engineering which would be supplementary to the course held at The Johns Hopkins University in 1910, and which would emphasize the practical rather than the theoretical aspect of the subject. Later it developed that members of the faculty of the University of Pennsylvania had discussed a like project. Happily these two ideas, of independent origin, were brought together before the Council of the Illuminating Engineering Society, and the lecture course was duly consummated. The result has been very gratifying to the Illuminating Engineering Society. The value of the course was demonstrated at the time of its presentation. This book is expected to extend that value. materially. CHARLES P. Steinmetz. |