This is one of the very best research books for light bulb collecting. "The History of the Incandescent Lamp" by Howell & Schroeder, was published in 1927. This book is a wealth of information for anyone interested in research or collecting within the early light bulb and electric field. This book summarizes the history of electricity from about 1600 and summarizes the history of incandescent light from 1840 to 1878. The book then details the history of Edison's efforts to develop and perfect the incandescent light from 1879 to the 1920's. With 208 pages and over 100 illustrations, Howell and Schroeder add tremendously to the existing body of work on this subject. The book measures 5.5 inches x 8 inches. It has a hard green cover with gold impressed title and an image of a glowing early incandescent lamp.