Demonstrating the Ingenious, Low-Tech Internal Mechanism That Makes a Perpetual Flip Calendar Change Dates -… [Video]

Demonstrating the Ingenious, Low-Tech Internal Mechanism That Makes a Perpetual Flip Calendar Change Dates -… [Video]
In a vintage shop, or in the home of an older relative, you may have seen one of these: That’s called a perpetual flip calendar, versions of which were first patented in the U.S. in the 1920s. The guy behind the "Measured Workshop" YouTube channel wanted to figure out how ... Watch/Read more