Future (space)ships
These drawings are some very cool concept designs of sci-fi-y spaceships and their environments. Lovely.
Today in 1936 a patent was issued for a better screw, the Phillips. It improved the efficiency of industrial production lines but made cam-out, where the screwdriver unseats from the screw, a phenomenon known to all who have tried to remove Phillips screws. I like the technical patent diagram.

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