Library of Congress
World Digital Library: Technology and the Representation of the World
An article discussing the tools the Islamic civilization astronomers developed and used to study the stars. Also discussed are the tools used in alchemy and metalworking.
Other
Astrolabe.org: The Astrolabe
A description of the ancient astrolabes and how they worked. Provides information about definitions, collections, and also includes photos.
Other
The Astrolabe: Home Page
This site provides a very general overview of astrolabe principles with links to other pages for more detailed information.