. Bulletin. Science. Figure 35.—Detail of links in the Roux system. (From Gustave Eiffel, La Tour de Trois Cents Metres, Paris, 1900, p. 156.) rollers, working within the hollow guides. Corre- sponding helical ribs in the guides rotated the rollers as the car moved. If the car speed exceeded a set it. © • ^. ^Q Q/ 4^ m^^^ qq©©oJjIq^ Figure 36.—Section of guide trunks in the Roux system. (From Gustave Eiffel, La Tour de Trois Cents Metres, Paris, 1900, p. 156.) limit, the increased resistance offered by the apparatus drove the rollers up into friction cups, slowing or stopping the car. The devi
. Bulletin. Science. Figure 35.—Detail of links in the Roux system. (From Gustave Eiffel, La Tour de Trois Cents Metres, Paris, 1900, p. 156.) rollers, working within the hollow guides. Corre- sponding helical ribs in the guides rotated the rollers as the car moved. If the car speed exceeded a set it. © • ^. ^Q Q/ 4^ m^^^ qq©©oJjIq^ Figure 36.—Section of guide trunks in the Roux system. (From Gustave Eiffel, La Tour de Trois Cents Metres, Paris, 1900, p. 156.) limit, the increased resistance offered by the apparatus drove the rollers up into friction cups, slowing or stopping the car. The device was considered ineffectual by Edoux and Eiffel, who were aware that the ultimate safety of the system resulted from the use of supporting cables far heavier than necessary. There were four such cables, with a total sectional area of square inches. The total maximum load to which the cables might be subjected was about 47,000 pounds, producing a stress of about 3,000 pounds per square inch com- pared to a breaking stress of 140,000 pounds per square inch—a safety factor of 46 ! ^^ If' M. A. Ansaloni, "The Lifts in the Eiffel Tower," quoted in Engineering, July 5, 1889, vol. 48, p. 23. The strength of steel when drawn into wire is increased tremendously. Break- ing stresses of 140,000 were not particularly high at the time. Special cables with breaking stresses of up to 370,000 were available. 36 BULLETIN 228: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution; United States. Dept. of the Interior; United States National Museum. Washington, Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off
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