XJF294061 Frontispiece to \'Oculus Artificialis Teledioptricus Sive Telescopium\' by Johann Zahn, 2nd edition published in 1702 (engraving) (b/w photo) by German School, (18th century); Private Collection; (add.info.: Johann Zahn (1641-1707), German philosopher; book first published in 1685; important work on the science of optics, covering instruments such as telescopes, microscopes, magic laterns and camera obscura;); German, out of copyright.