Here you can find a photograph of an Astrolabe: http://www.cncdp.pt/oceanos/n22/artigos/por/por03.jpg I found it in the magazine Oceanos. It's homepage (English version) is at: http://www.cncdp.pt/oceanos/outros.html If you browse this place, you may find more images of nautic instruments.
Some more images of astrolabes:
In the next www page you can see several nautic instruments including an
Astrolabe http://www.cncdp.pt/cncdp/crista/9/8.html
Here you can see a man using the astrolabe
http://www.cncdp.pt/cncdp/crista/9/9.html (Acompanying text in Portuguese
only).
One from the Marine Museum in Lisbon opening page:
http://www.museumarinha.pt/ (other images inside).
Sergio
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