Motor 



Figure 23. — Backmann's proposed helicoidal elevator for the 

 upper section of the Eiffel Tower. The cars were to be self- 

 powered by electric motors. Note similarity to the Miller 

 system (fig. 20). (Adapted from The Engineer (London), Aug. 

 3, 1888, vol. 66, p. loi.) 



22 



BULLETIN 228: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY 



