EULER, Leonhard (1707-1738). Tentamen novae theoriae musicae ex certissimus harmoniae principiis dilucide expositae, St. Petersburg: ex Academiae Scientiarum, 1739, 4°, FIRST EDITION, engraved vignette to title, 6 plates, all but one folding (good copy with wide margins, leaves slightly browned, library stamps) contemporary calf-backed speckled boards (front joint tender but two cords holding, spine chipped, one compartment torn away, spine rubbed, corners bumped), sprinkled edges. Provenance: JCL