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Around 170,000 lantern size glass slides, manufactured from 1900 up to 1980 from all fields of Archeology and Art History, used by famous art historians such as Erwin Panofsky and Wolfgang Schöne. Slide Projectors. Digitization in progress since 2016, about 3,000 images online in database (password protected).
An overhead projector works on the same principle as a slide projector, in which a focusing lens projects light from an illuminated slide onto a projection screen where a real image is formed. However some differences are necessitated by the much larger size of the transparencies used (generally the size of a printed page), and the requirement ...
A darker (grey) screen reflects less light, of course—both light from the projector and ambient light. This decreases the luminance (brightness) of both the projected image and ambient light, so while the light areas of the projected image are dimmer, the dark areas are darker; white is less bright, but intended black is closer to actual black.
The first large-format slide projectors were built in the middle of the 20th century as background projectors for theaters and opera houses. From the early 50', the german Brand Reiche&Vogel was offering in a catalog a 2000w slide projector using 4.75"x 4.75" (12x12cm) slide or a scroller for film strip of the same size.
This slide projector, sold under the Zeiss Ikon brand, uses a straight-through tray; a thin arm grabs slides from a tray and puts them into the light path; the tray is advanced along its length. At the front of the projector, the protruding projection lens features rings to control focal length and focus.
a snow effect slide can add snow to another slide (preferably of a winter scene) by moving a flexible loop of material pierced with tiny holes in front of one of the lenses of a double or triple lantern. [65] Mechanical slides with abstract special effects include: Slide with a fantoccini trapeze artist and a chromatrope border design (c. 1880)