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.
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New York: Van Nostrand. Frontispiece, 7 plates, and other in-text illustrations. 86 pages. Slim 8vo, original gilt-lettered dark blue cloth. New York: Van Nostrand, 1903. First edition. A very good(+) bright copy. Hammer (1858-1934), Chief Engineer with Edison, first suggested and used radium for cancer and tumor treatment. In addition he invented luminous radium preparations used for watch dials, clocks, etc. His work preceded Mme. Curie's Recherches sur les substances radioactives by a year.