Dear friends This year we commemorate the 500th anniversary of Pedro Nunes the most famous Portuguese mathematician. He invented the nautical ring very similar to the shown sundial (from EPACT pages, made by Humphrey Cole, British Museum collection), http://www.mhs.ox.ac.uk/epact/catalogue.asp?sort=makerindexform&enumber=89914
but the scale instead to give the hour gives the Sun altitude. Comandante Estácio dos Reis (a well know authority in Portugal for ancient nautical instruments) is very much interested to know if in the instrument collections of the world there is at least a nautical ring. We would appreciate any assistance you may offer. Thanking you in advance António Lopes (Ph.D.) ________________________________________________________________ Instituto de Tecnologia Química e Biológica (ITQB/UNL) Mail: ITQB -Ap. 127, P-2781-901 Oeiras, Portugal Phone:+351-21-4469725 Fax:+351-21-4411277 Email: [EMAIL PROTECTED] Web: http://www.itqb.unl.pt ________________________________________________________________ Universidade Lusófona de Humanidades e Tecnologias (ULHT) Mail: ULHT -Campo Grande 376, P-1749-024 Lisboa, Portugal Phone:+351-21-7515500 Fax:+351-21-7577006 Email: [EMAIL PROTECTED] Web: http://www.ulusofona.pt ________________________________________________________________ -
