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Posted 9 months ago by boyt in category: magic   Comments (0)


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Posted 7 months ago by Dunk in category: geeky   Comments (0)


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Bill describes the Alignment Optical Telescope used in the Lunar Module on the Apollo missions to the moon. This telescope took star sightings which were used to align the Module's guidance system. Bill shows how the telescope used an Archimedes spiral inscribed on its eyepiece to replace the heavy motors, worm gears, and rigid tracks used in a traditional sextant -- this shaved weight from the Lunar Module and allowed it to carry more fuel.
Posted 1 year ago by Grandpa in category: space   Comments (0)



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Green screens
Posted 6 years ago by boyt in category: interesting   Comments (2)


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How deep before it dies?
Posted 1 year ago by Zerka in category: technology   Comments (0)