Portal:Technology/Selected pictures/1From Wikipedia, the free encyclopedia EscalatorCredit: Stig NygaardAn escalator is a moving staircase for carrying people between floors of a building. The device consists of a motor-driven chain of individual, linked steps that move up or down on tracks, allowing the step treads to remain horizontal.More selected pictures
EscalatorCredit: Stig NygaardAn escalator is a moving staircase for carrying people between floors of a building. The device consists of a motor-driven chain of individual, linked steps that move up or down on tracks, allowing the step treads to remain horizontal.More selected pictures