Скачать или смотреть Who Invented the Revolving Door?

Theophilus Van Kannel of Philadelphia was awarded a US Patent on the Revolving door in 1881. Van Kannel said that the door provided “numerous advantages over a hinged-door” because it was among other things, “noiseless in operation”, “prevents the entrance of wind, snow, rain or dust”, and excluded “noises of the street.” Interestingly the door is perfect for inflatable air supported architecture. These structures came on the scene about one hundred years after the door’s invention. Van Kannel rightly said of his invention “the door cannot be blown open by the wind as the pressure is equal on both sides of the center of motion”. And that’s precisely why it works for inflatable structures.