The Astrolabe (Popularity: ): Ancient astronomical computer. Caltech Astronomy - History (Popularity: ): The telescopes at Mt. Wilson and Palomar. Churches as Scientific Instruments (Popularity: ): Solar observatories built into 17th and 18th century cathedrals. Virtual Museum of Measuring Engines (Popularity: ): The history of modern astronomical measurement, emphasis on instruments. The 28-inch Photo-visual Refractor (Popularity: ): Exhibition from the Royal Observatory, Greenwich, that explains the history of this telescope via words and archive photographs. Antique Telescopes (Popularity: ): An overview with photographs of many lesser known telescopes typical of their time.
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