Watkin's Tower Eiffel Tower in Paris, France, Watkin invited Gustave Eiffel himself to design the tower, but the Frenchman declined – replying that if he designed the tower, the French people "would not think me so good a Frenchman as I hope I am." An architectural design competition was held in 1890, and a total of 68 designs were submitted. Some of the more exotic proposals included a £1m tower inspired by the Tower of Pisa; a structure with "a captive parachute to hold four persons"; and a tower with a spiral railway climbing its exterior. One design included a 1/12-scale model
Eiffel Tower gaps in the latticework. In the years since it was completed, engineers have put forward various mathematical hypotheses in an attempt to explain the success of the design. The most recent, devised in 2004 after letters sent by Eiffel to the French Society of Civil Engineers in 1885 were translated into English, is described as a non-linear integral equation based on counteracting the wind pressure on any point of the tower with the tension between the construction elements at that point. The Eiffel Tower sways by up to 9 centimetres (3.5 in) in the wind. When originally built, the first