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Viva la revolution

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Revolving doors work well as air locks and for crowd control, important factors in these times of high security. But they are complicated beasts whose workings are normally concealed overhead and under the floor. How do you incorporate this successfully into frameless facade glazing? GU Technologies has engineered four Vista-Lite doors for subcontractor JML Engineered Facades, for the entrance to 111 Buckingham Palace Road in London. The revolves have their own glass roofs, with only the edges of the four glass-door leaves bound by strengthening metal frames.

At London's Oxford Circus, one of the country's earliest revolving doors is still in use at the former Regent Street Polytechnic building in Upper Regent Street, now the headquarters of the University of Westminster. The first revolving door patent was taken out in 1884 by Theophilus von Kannel (1841-1919) of Philadelphia.

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