Menu   Introduction   Catalogue   Essay   Handlist   Museums   Makers   Bibliography   Places   Conventions   Articles   Credits   Glossary   Help   Search   Index				'A. D.' The signature 'A. D.' is found in the form of a monogram on a quadrant dated 1553 from Naples belonging to the collection of the Museum of the History of Science in Florence. Whether this represents an owner or a maker, and with whom it should be identified, has yet to be established. For instruments by 'A. D.', see:    Quadrant, Signed 'A. D.', Naples, Dated 1553 (Firenze, IMSS) || Introduction || Essay || Museums || Bibliography || Conventions || Credits || Privacy || Help || || Catalogue entries || Handlist || Makers || Places || Articles || Glossary || Search || Home ||