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All printer suppliers produce their own type of ink cartridges. Cartridges for different printers are often incompatible — either physically or electrically. Some manufacturers incorporate the printer's head into the cartridge (examples include HP, Dell, and Lexmark), while others such as Epson keep the print head a part of the printer itself.
A worker loads documents into an Ozalid printer. Allied to the US Navy development of the improved lightweight overhead projector was its adaptation of the Ozalid dry printing process, developed in Germany in 1923, to copy training documents and illustrations on projection transparencies, a process simple enough to be carried out in the field ...
One of the primary differentiators between slide projectors was the form factor of the cartridges used to hold and, in many cases, store slides. Some automated slide projectors offered slide trays with straight, rectangular shapes, [ 12 ] which were popular in Europe; these use an arm, moving laterally, to extract a slide from the cartridge for ...
Simulation of a spinning zoopraxiscope An early projector and seats from a movie theater. The main precursor to the movie projector was the magic lantern.In its most common setup it had a concave mirror behind a light source to help direct as much light as possible through a painted glass picture slide and a lens, out of the lantern onto a screen.
The magic lantern used a concave mirror behind a light source to direct the light through a small rectangular sheet of glass—a "lantern slide" that bore the image—and onward into a lens at the front of the apparatus.