RARE FIRST EDITION. THREE VOLUME SET monograph on wave mechanics by Louis-Victor-Pierre-Raymond, 7th duc de Broglie (1892-1987), an eminent French physicist who gained worldwide acclaim for his groundbreaking work on quantum theory. [ALL VOLUMES]: 250x165mm. [227]+[142]+[158] pages. Softcover. Lettering on front cover and spine. Pages rough-cut as published. Cover corners and edges, and spine hinges bumped or worn. Spine rubbed. [VOL.I]: Contains 5 b&w plates. Cover age-stained. Spine stained. Spine bottom edge worn and slightly (15mm) torn. Page 227 bottom part torn - no damage to text. Binding visible between last page and plates. Pages browning. [VOL.II]: Cover and spine slightly stained. Spine browning and worn. Spine front hinge bottom edge slightly (7mm) torn. Spine upper edge worn. Binding loose and visible on inner cover and between several pages. Rear cover detached from binding. Pages yellowing. [VOL.III]: Cover and spine yellowing/age-stained. Spine front hinge bottom edge slightly (8mm) torn. Spine upper edge worn. Pages slightly yellowing. [SUMMARY]: This rare 3 volume treatise by the celebrated Nobel laureate in physics is in good overall condition.