Radium, and Other Radio-Active Substances; Polonium, Actinium, and Thorium, with a consideration of Phosphorescent and Flourescent Substances, the Properties and Applications of Selenium and the Treatment of Disease by the Ultra- Violet Light.
New York: Van Nostrand, 1903. 41 illus. 72pp. + ads. Thin 8vo, orig. gilt-lettered cloth. New York: Van Nostrand, 1903. First Edition. Very good (+). Inscribed by the author. Hammer was an assistant to Thomas Edison and responsible for tests and records on incandescent lamps, later chief engineer of the Boston Edison Company and Edison's personal representative to the Paris Exposition of 1889. DAB. More