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March 2, 2018 08:25 pm PST
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/nkSlo414QOg/the-ingenious-perpetual-flip-c.html
The ingenious perpetual flip calendar from the 1920s
This Perpetual Flip Calendar has a nifty way of displaying the date every time you rotate it 180 degrees. The Measured Workshop YouTube channel got the 1926 patent application and recreated one out of wood.
Here's a 3D printed version!
Image: YouTube
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/nkSlo414QOg/the-ingenious-perpetual-flip-c.html
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