Working in close cooperation with M-G-M Special Effects Supervisor Tom Howard, Kubrick set about building his own super-powerful 8 x 10 projector, with a condenser pack 18 inches thick made up of condensers from standard 8 x 10 enlargers. The most powerful water-cooled arc available was employed as a light source and it was necessary to use slides of heat-resistant glass in front of the condensers in order to prevent the heat from peeling the magenta layer of emulsion right off of the transparency. At least six of the rear condensers cracked because of the heat during the filming, but this was usually due to a draft of cold air hitting the projector when someone opened the door of the sound stage while the projector was operating.
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