Menu   Introduction   Catalogue   Essay   Handlist   Museums   Makers   Bibliography   Places   Conventions   Articles   Credits   Glossary   Help   Search   Index				'D O' The signature 'D O' is engraved on the meridian line of a surveying instrument in the Museum of the History of Science in Oxford. Who the signature belongs to has not yet been established. For instruments by 'D O', see:    Surveying Instrument, Signed 'D O', German, circa 1600 (Oxford, MHS) || Introduction || Essay || Museums || Bibliography || Conventions || Credits || Privacy || Help || || Catalogue entries || Handlist || Makers || Places || Articles || Glossary || Search || Home ||