<span>Typed third draft of chapter six of Biography of Charles F., Sr., written by Margaret Richardson. Chapter concerns history of arc-lighting and research by Brush into practical application of electrical arc-light. </span><span>Includes correspondence, notes, and other research materials used in writing chapterCharles F. Brush, Sr., PapersSeries 11: Margaret Richardson's Biography of Charles F. Brush (1948-1954)Subseries 1: ChaptersBox 32Folder 17</span>