The Otis Elevator Company manufactures, installs and maintains elevators, escalators and moving walkways. In 1904, the Underground Electric Railways Company of London, a precursor of today’s London Underground, purchased 170 electric elevators from the company, to be installed between 1905 and 1907. The album contains images of elevators and elevator equipment being installed at subway stations in London. The photographs are labeled by station and date. Most of the images show the equipment used to raise, lower and brake the elevator, often already installed at the top of the elevator shaft or in a machine room.