Mention has already been made of office and other elevators, in which compressed air is an important factor in operating the same and for preventing accidents. 威廉·亨利·杜利特.世纪发明.
The century was half through with before it was proposed to use water and steam for passenger elevators. 威廉·亨利·杜利特.世纪发明.
Not only are passengers conveyed up and down by electric elevators in skyscrapers, but the buildings themselves are erected by means of electricity. 佚名.神奇的知识之书.
The Story in Elevators and Escalators[15] 佚名.神奇的知识之书.
The operating-room referred to was on the fifth floor of the building with no elevators. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
The supplies for cities and for families are estimated, measured and recorded as easily as are the supplies of illuminating gas, or the flow of food from elevators. 威廉·亨利·杜利特.世纪发明.
The summit of the tower was reached by staircases containing 1,793 steps, and by hydraulic elevators running in four stages. Edward W. Byrn.十九世纪发明进展.
Then came the overhead circuits for distributing electrical energy to motors for operating elevators, driving machinery, etc. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.