M. LUCKIESH.




ACKNOWLEDGMENTS


It is a pleasant duty to acknowledge the coöperation of various
companies in obtaining the photographs which illustrate this book. With
the exception of Plates 2 and 7, which are reproduced from the excellent
works of Benesch and Allegemane respectively, the illustrations of early
lighting devices are taken from an historical collection in the
possession of the National Lamp Works of the General Electric Co. To
this company the author is indebted for Plates 1, 3, 4, 5, 6, 9, 11, 15,
18b, 20, 21, 29; to Dr. McFarlan Moore for Plate 10; to Macbeth Evans
Glass Co. for Plate 12; to the Corps of Engineers, U. S. Army, for Plate
13; to Lynn Works of G. E. Co. for Plates 14, 16; to Edison Lamp Works of
G. E. Co. for Plates 17, 24; to Cooper Hewitt Co. for Plate 18a; to
R. U. V. Co. for Plate 19; to New York Edison Co. for Plates 22, 26, 30;
to W. D'A. Ryan and the Schenectady Works of G. E. Co. for Plates 23, 25,
31; to National X-Ray Reflector Co. for Plate 28. Besides the companies
and the individuals particularly involved in the foregoing, the author
is glad to acknowledge his appreciation of the assistance of others
during the preparation of this volume.