Figure 37. — Schematic diagram of the Edoux 

 system. (Adapted from Gustave Eiffel, ia Tour 

 de Trois Cents Metres, Paris, 1900, p. 175.) 



Figure 38. — Vertical section through lower 

 (suspended) Edoux car, showing Backmann 

 helicoidal safety brake. (Adapted from Gus- 

 tave Eiffel, La Tour Eiffel en igoo, Paris, 1902, 

 p. 12.) 



A curiosity in connection with the Edoux system 

 was the use of Worthington (American) pumps (fig. 

 40) to carry the water exhausted from the cylinders 

 back to the supply tanks. No record has been found 

 that might explain why this particular exception was 

 made to the "foreign materials" stipulation. This 

 exception is even more strange in view of Otis' futile 

 request for the same pumps and the fact that any 

 number of native machines must have been available. 

 It is possible that Edoux's personal influence was 

 sufficient to overcome the authority of the regulation. 



PAPER 19: EIEVATOR SYSTEMS OF THE EIFFEL TOWER 



37 



