A revolution in door design
Aug 29, 2019
2 minutes
![f0062-01](https://article-imgs.scribdassets.com/7uonpyu3cw7o9gj6/images/fileW3QCJRVY.jpg)
With revolving doors being so ubiquitous, few of us would give a second thought as to how revolutionary the design proved when it was patented back in 1888.
As with so many of the inventions we now take for granted, it’s easy to underestimate the creative leap that took Philadelphia native Theophilus Van Kannel from a conventional hinged door to one made from three ‘wings’
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