Dumont, Gabriel Pierre Martin (1720-91) (after); French. Medium: engraving. Date: 1741. L'Observatoire Royal; designed by Claude Perrault (1613-88); begun in 1667 and completed in 1672: built of stone to avoid the risk of fire and without metal to avoid magnetic disturbance; founder was French king Louis XIV; Provenance: Private Collection. Photographic Rights The Bridgeman Art Library.