. >> here we were at the historic st. francis hotel, which was actually a representation of the evolution of elevators. can you tell us more about san francisco history here at the st. francis? >> sure. st. francis demonstrates well the evolution of elevated technology. and substantially damaged the 1906 earthquake and rebuilt in 1907 or 1908, and extend it again in 1913. then a new tower was added in 1932, so there is all sorts of elevator technology you can see at the st. francis that very much represents the building history of san francisco. >> i understand there is a really old elevator still operating here. >> that is right, the elevator installed in the 1913 expansion. we can go look at that. >> let's go take a look. here we are in a spectacular st. francis lobby. here is the clock. when people say "meet me at the clock in the st. francis." let's look at that elevator. >> ok, let's do it. >> here we are in the elevator installed as part of the expansion, and this is the way it was originally installed about 100 years ago. it has