New York and London: Harper & Brothers Publishers, (1911). First edition. 8vo. (xii), 1-(332) pp. Signed by Edison on second free leaf. Illustrated with a frontispiece portrait and seven plates. Publisher's green cloth-covered boards, stamped in blind and in gilt, with a paper cover label portrait of Edison, gilt faded on front board and spine, spine slightly soiled, front board slightly soiled, corners lightly worn, cocked; all edges trimmed; dampstaining to prelims, some plate corners and surrounding text leaves; text lightly toned; some scattered spotting; child's scrawl in pencil at head of p. 225; ink stamp on second free leaf.