CHT163682 The Great Lyre of the Universe, from \'L\'Harmonie Universelle\' by Marin Mersenne (1588-1648), 1636 (engraving) (b/w photo) by French School, (17th century); Bibliotheque des Arts Decoratifs, Paris, France; (add.info.: La Grande Lyre de l\'Univers; studied the acoustics of vibrating strings and organ pipes; measured the speed of sound; treatise on music, maths, optics and philosophy; published in \'Revue d\'histoire du theatre\' 1959;); 穢 Archives Charmet; French, out of copyright.