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Did you ever wonder how sailors of old navigated the open seas without modern technology? Well, this weekā€™s video may shed some light on the subject.  The ā€œMariner's Compass Rectified,ā€ (1787) by Andrew Wakelyā€”the third of nine videos from the #MovableMondays series, is housed in the Rare Book Collection on the fifth floor of Alden Libraryā€™s Mahn Center.

The video highlights another example of a volvelle, a moveable feature consisting of two concentric circles made of paper or parchment that would have originally been seen in medieval manuscripts.

Here the circle spins, but oftentimes, said Miriam Intrator, special collections librarian, ā€œyouā€™ll see more layers [of paper] containing different types of information.ā€ As a navigational text, mariners could have calculated the sunrise or a constellation on any given date.

According to , a curatorial assistant at the Getty Museum, the volvelle was an innovative tool for its time. The paper ā€œcalculating device was considered a form of ā€˜artificial memoryā€™ that freed users from committing large amounts of detailed information to mind. Because of this, the device has been compared to early computersā€”though a comparison to a floppy disk might be more accurate.ā€

In spite of what appears to be a simplistic device, a volvelle provided a wealth of data to early scholars and mariners.

Follow the series on the Librariesā€™ social media accounts: , , and .

And be sure to check out the Feb. 25 #MovableMondays that will feature ā€œNaughty Boys.ā€ Here is what you may have missed: ā€œAstronomicum Caesareumā€ and ā€œThe Daily Expressā€