This book is the "History Of Electric Light" by Henry Schroeder, published in 1923 by the Smithsonian Institution. This soft cover book is perhaps the most informative piece for individuals interested in research or collecting Edison-ian light bulbs. It summarizes the history of electricity from 1600 and Schroeder details Arc lighting and incandescent light to 1913. With 94 pages and 92 illustrations, Schroeder's book is well presented and may have some advantage over the later Howell and Schroeder (1927) treatment of the same subject in that this book's research was done closer to the actual period of development of the early electric lighting industry. It measures 6.25 x 9.25, has a soft gray cover. This wonderful resource is a valued tool for collectors and historians alike.