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File talk:World Trade Center Building Design with Floor and Elevator Arrangment.svg Metadata This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
A residential elevator with integrated hoistway construction and machine-room-less design. A residential elevator or home lift is often permitted to be of lower cost and complexity than full commercial elevators. They may have unique design characteristics suited for home furnishings, such as hinged wooden shaft-access doors rather than the ...
The invention of the elevator was a precondition for the invention of skyscrapers, given that most people would not (or could not) climb more than a few flights of stairs at a time. The elevators in a skyscraper are not simply a necessary utility like running water and electricity, but are in fact closely related to the design of the whole ...
Overhead projector in operation, with a transparency being flashed. A transparency, also known variously as a viewfoil or foil (from the French word "feuille" or sheet), or viewgraph, is a thin sheet of transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn.
Overhead projector in operation during a classroom lesson An overhead projector (often abbreviated to OHP ), like a film or slide projector , uses light to project an enlarged image on a screen , allowing the view of a small document or picture to be shared with a large audience.