Adler Planetarium - Historical Collections: Collection of instruments, past exhibitions, history department information.
Antique Telescopes: An overview with photographs of many lesser known telescopes typical of their time.
Caltech Astronomy - History: The telescopes at Mt. Wilson and Palomar.
Churches as Scientific Instruments: Solar observatories built into 17th and 18th century cathedrals.
Important Astronomers, their Instruments and Discoveries: From the merket to the reflecting telescope in three pages.
Sir Martin Ryle - Nobel Lecture: Radio telescopes of large resolving power.
Smithsonian Magazine - Stars in Their Eyes: The exquisite telescopes crafted by Alvan Clark and his sons helped make the last half of the 19th century a golden age of astronomy.
The 28-inch Photo-visual Refractor: Exhibition from the Royal Observatory, Greenwich, that explains the history of this telescope via words and archive photographs.
The Astrolabe: Ancient astronomical computer.
Virtual Museum of Measuring Engines: The history of modern astronomical measurement, emphasis on instruments.